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Expert Answers about Electrical Tools


  • What Ohms Should Trailer Brake Magnets Be?
  • Assuming that when you tested the resistance of the brakes you were testing the two wires on each magnet and getting 2.0 and 2.8 ohms the magnets on your trailer are not working correctly and will need to be replaced. For 7" brakes you should get 3.8-4.0 ohms, and for 10-12" brakes you should have 3.0-3.8 ohms. If the brake shoes themselves are good you can replace just the magnet using 7" # AKBRKR-M7, 10" # AKBRKR-M10, or 12" # AKBRKR-M12. If the shoes are needing replacement...
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  • How Do I Troubleshoot The Trailer Wiring Of My 2022 Toyota Highlander
  • In order to troubleshoot your 2022 Toyota Highlander wiring installation you will need some tools to assist you. You will need a 12V circuit tester. I recommend the Cordless Circuit Tester, part # PTW2979. In addition, you will also need basic wiring tools, electrical tape, a wire stripper, dielectric grease, and wiring fasteners. Troubleshooting your trailer wiring can be very intensive. This can be caused by a number of issues. If you have a plug in harness, it may be for models with...
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  • How To Install a Brake Controller on 2017 Mercedes-Benz Sprinter 3500
  • You can hard-wire in a brake controller and it seems that there are not a lot of the Sprinter 3500 models that are pre-wired, at least from what I've seen in my research. I have not seen any reports that this isn't possible, and we even have an installation video to walk you through the process. The way to find out whether or not the plug is present by using a circuit tester like the # 40476 and testing for a hot wire when the brake is pressed- it's possible that one of the plugs that...
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  • Converting to Electric Trailer Brakes From Hydraulic on 3,500 lb Axle
  • Yes, we can get your set up to go from hydraulic to electric brakes, and your photo (thanks so much for that) shows you have a 10 inch brake drum. So here is everything you'll need in order to switch: - Electric Trailer Brake Kit # AKEBRK-35-SA - Mounting Hardware for 10" Brake Assemblies # BRKH10B - Deka Jacketed 2 Wire, 10 Gauge, Brake Wire - per Foot # 10-2-1 - Bright Way Push-to-Test Trailer Breakaway Kit # 3802308 - Deka Heat Shrink Butt Connector - 12-10 Gauge # DW05745-5 The...
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  • Will the Pollak Circuit Tester Work on Newer Trucks Using LED Lights
  • While the Pollak 7-Way to RV Socket LED Circuit Tester # PK12741 is designed to work with all 7-way connectors. There have been issues with vehicles such as Audi, Mercedes-Benz, and Volkswagen that have issues due to the LED lights having such a low power draw. The newer truck models are starting to have some of those same issues since they are starting to use led lights as well, so the tester will most likely not draw enough power to work. The best way to remedy that if it happens for...
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  • Does 12-V Trailer Connector Circuit at 7-way on 2017 Ford F350 Remain Active With Vehicle Running
  • Once the trailer is plugged in and the brake pedal is depressed, the 12-volt power circuit on the trailer connector will become active, and can be used for whatever purposes you wish. Keep in mind that this circuit can maintain a trailer battery, but it won't have the available grunt to charge a discharged battery. To fully charge the battery while the tow vehicle is running, you'll need a DC to DC charger like # 331-BCDC1240D for a 40 amp or # 331-BCDC1250D for a 50 amp charger. If you...
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  • 7 Way Trailer Connector Vehicle Tester For 2020 Ford F-150 With OEM Trailer Brake Controller
  • Yes, the 7 Way Trailer Connector Vehicle Tester # TR20117 is specifically designed to work with the OEM integrated brake controller on your 2020 Ford F-150 with the tow package and pro backup assist. It may or may not work with other vehicle manufacturers OEM controllers if you are wanting to use it with multiple vehicles.
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  • Reverse Light & Wiring For Boat Trailer
  • So in order to add a reverse light to your boat trailer, all you need to do is connect the wiring from your junction box or 7-way directly to the reverse light's wires. For reverse lights, if you don't already have wiring at the junction box or your 7-way, what you can do is add 14 Gauge Primary Wire - Blue - per Foot # DW02414-1. Then you will simply run that wire to the reverse lights, which you can connect with butt connectors. The exact parts you will need to do this are the following: -...
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  • Wire Functions of Triple LED Trailer Tail Light CE44VR
  • While we wouldn't have any way of knowing what the 8 wires are for with your current light, I can tell you the functions of each wire for the Triple LED Trailer Tail Light # CE44VR. Then what you would need to do is match those wires with the correct ones on your RV, and you can find out what wires are for what function on your RV by using a circuit tester like the Cordless Circuit Tester # PTW2979. After that it would just be a matter of matching the wires by function (and not color),...
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  • Troubleshooting Thermostat That Is Reading The Wrong Air Temperature.
  • Great question, lets walk through some troubleshooting steps and figure this out. **Digital Multimeter with 42" Long Test Leads - LED Display # PT89ZR. Since we will be troubleshooting I recommend you get a multimeter like the digital one linked above. First, make sure you have the thermostat on the right setting. I know it seems obvious but sometimes we just forget to switch it over from hot to cold or vice versa. Next turn the thermostat to at least 5 degrees different than...
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  • Can I Use the Tekonsha 7 Way Plug Tester with a Redarc Tow Pro Liberty Brake Controller
  • Yes. The Tekonsha 7-Way, RV-Style Tester for Brake Controllers - LED Test Lights # 6562 will plug into a 7 way trailer plug on your 2015 Toyota Highlander and allow you to test the function of a Redarc Tow Pro Liberty # RED24FR without any issues.
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  • Comparison Between 6562 & Standard 7-Way Testser
  • A standard 7-way plug-in tester like the Tekonsha 7-Way, RV-Style Tester # 6562 gives you basic functions of the 7-way, and is a great choice for doing that. The difference is the voltage and current given for the different functions with the Current Monitor with 7-Blade Connector # 6565. That is the biggest difference, along with the long cable from the 7-way so you can use the manual override to check your brake controller voltage and current at different settings. That's the difference,...
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  • Troubleshooting Trailer Brake Lights and Turn Signals Not Working After Installing 7 Way on Vehicle
  • If you've just installed a 7 way connector like the # ETBC7, you'll want to start by testing the plug on the vehicle using a circuit tester like the # PTW2979 to make sure that each pin is operating properly; you can refer to the photo attached or a helpful article that I've linked for information on testing the circuits. I would also recommend making sure that your ground wire on this harness is firmly grounded to a paint and rust free spot, as ground wires are the most common cause for...
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  • Troubleshooting a Furrion Back Up Camera that Will Not Turn On But Will Work on Another Truck
  • Given the information you provided about the camera working fine when plugged into the cigarette lighter and on another truck, it definitely seems like it is most likely an issue with your truck and the camera not getting enough power. You can use a Circuit Tester Kit # 40376 to check your 7-way pins and the wiring behind your 7-way to try and locate a wiring issue that could be causing this issue. I would start with the 7-way pins, it could be something as simple as giving the pins...
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  • Troubleshooting Trailer Brake Controller Brake Power at 7-Way Without Trailer Connected
  • When you don't have a trailer hooked up to your 2007 Silverado, the 5 o'clock pin where the brake controller output is, should not have any power until you put a draw on that wire with your test light like circuit tester # PTW2993. As soon as a draw is placed on that pin, there should be a dim light that should increase in intensity as you hit the manual override slide on your controller. A proportional brake controller will not show braking because you are not moving except with the...
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  • Recommended 7 Way Trailer Wiring Harness for 2015 Jeep Wrangler Unlimited JKU
  • In order to install a 7 way connector on your 2015 Jeep Wrangler JKU I recommend using the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires # ETBC7L. The # ETBC7 uses the functions of your existing 4 way and comes with the wiring, butt connectors, circuit breakers and ring terminals needed to complete the installation. The good news is that because you'll be using the Tekonsha Prodigy RF # TK94FR, you won't need to run a wire for the brake...
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  • Which Fuse In 2013 Ford F-150 Controls Trailer Turn Signals?
  • Since the trailer connector on your 2013 Ford F-150 is no longer sending power to the turn signal circuits on your trailer you will need to replace fuse # 73. This 20 amp fuse is located in the engine bay fuse box and is what sends power to the trailer turn signals and is what would have blown when you accidently shorted the trailer turn signals. You will want to use a circuit tester like # 40376 to test each side of the fuse to verify if power is making it through or not as some times...
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  • MaxxAir Fan Troubleshooting
  • On the MaxxFan website it says, "Yes, the MAXXFAN and MAXXFAN Plus are designed with dual lifting arms to fully support the lid if installed properly. This makes the lid very sturdy and able to withstand high driving speeds when left open, it also prevents the lid from vibrating and rattling during high winds when the RV is parked. Be sure to fully open the lid when driving so the dual lift arms provide the maximum support for the lid." I would take down the bug screen from the inside...
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  • Availability of Circuit Testers for Use When Installing Trailer Wiring in Ford F-150
  • Thank you for your purchases from etrailer back in June. You are correct that we do offer trailer wiring kits that come pre-packaged with a basic circuit tester. One such example is the Draw-Tite Wiring Kit # 18252 that fits the 2010 F-150. But no worries! We also offer stand-alone testers like # 40376. I have linked a video showing how the tester can be used to test for signals on trailer wiring. I was able to use your email address to find purchase history for a few different...
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  • Tekonsha Voyager XP Brake Controller Installed On A 2006 GMC Sierra 2500 Not Engaging Brakes
  • There are a few tests you can do first before you go replacing your Tekonsha Voyager XP. In your truck cab sever the blue wire several inches from back of the brake controller, and use a circuit tester # 40376 to check for power on the back of the unit when the brake pedal or the manual override is engaged. If there is power to the controller at idle, then that is indicating that there a problem with the controller and will need to be replaced. You can reconnect the blue wire...
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  • Will the 1/2 Inch Metal Loom Clamps Work On a 5/16 Inch Frame Rail
  • Yes, the Metal Loom Clamp part # A0500 will work on a trailer frame that is 5/16" thick. The Metal Loom Clamp will actually work on pretty much any frame thickness but you will need to make note of the size screw used. I recommend the Hex Screw part # 101131802 for a 5/16" thick frame as it is 1/2" long. The Wire Loom part # 459075 can then be added to protect your wiring. I have attached a list of our other wiring accessories for you below as well.
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  • Troubleshooting Error On Prodigy P2 When Breakaway Battery is Connected
  • It sounds like your breakaway pin isn't pushed all the way in. You can check this with a circuit tester like # 40376 to see if there is power on the wire coming from the breakaway going to the trailer's brakes. If the pin is inserted correctly you should have power going in the switch but not coming out. If you continue to have problems, I would be more than happy to continue to troubleshoot this issue with you.
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  • Troubleshooting 2002 F-250 Towing Horse Trailer with Working Exterior Lights but No Interior Lights
  • It sounds like the interior lights on your trailer are powered through the 12 volt circuit on your Ford's 7-way. So, start by testing to make sure that pin is active. On a standard RV style 7-way, this is located at the 1 o'clock position. I've attached a diagram for visual reference. Using a tester like # PK12741 would be the easiest. You could also simply have a case of corrosion on/in the connectors that is preventing the +12V auxiliary power from reaching the trailer. If this is...
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  • Brakes On Trailer Stop Engaging When Using Tekonsha Prodigy Brake Controller
  • I would begin by checking the connections on the back of the brake controller. You will want to make sure none of the wires have become disconnected or that there are not any bad connections. It sounds like the Blue wire which sends power to the trailer brakes may have a bad connection somewhere. I would start by cutting the blue wire a few inches from the brake controller and see if you get signal. If you do get signal, the Blue wire may have a bad connection somewhere. If you do not get...
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  • Brake Controller Recommendation for a 2012 Ford F-150
  • The best solution I can provide for you would be to replace the integrated controller of your 2014 Ford F-150 with a more reliable aftermarket controller like the P2 # 90885. You will be required to take your truck to a Ford dealer once you complete the replacement of the controller so that you can have the codes on the dash turned off. See attached article. To install the controller you will also need the install adapter part # 22292.
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  • 2013 Ford F150 Long Bed Pickup Trailer 12 Volt Power Fuse Location
  • On your 2013 Ford F-150 the are are two things to look at. They are both located in the power distribution center under the hood. Remove the cover and check position #9 that is the relay for the trailer power circuit. The second is position # 21 this is the trailer power relay fuse. It requires a 30 amp fuse. The Tow Ready 7 Way Trailer Connector Vehicle Tester part # TR20117 can help identify when power is present.
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  • No Power to 12 Volt or Trailer Brakes on 2015 Ford F-350
  • The first thing to do is take a look at your owner's manual to locate any trailer fuses or relays and ensure they are all there and in working order. If they are, in order to determine the specific problem you will need to purchase a circuit tester if you do not have one - the very handy Cordless Circuit Tester # PTW2979 would be my strong recommendation due to how easy it is to use - and test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going...
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  • Determining Axle Length for 73 Inch Outside to Outside Frame Trailer
  • Assuming you have an existing axle, the best way to determine the axle you need is by measuring from hub face to hub face. Once you have this measurement you can measure from the center of the leaf spring to the center of the other leaf spring to make sure there is a compatible replacement. If you do not have an existing axle you will need to take in to account the width of the tires and wheels you intend to use as well as the spindle length. Start with the width of your trailer with...
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  • Does Tekonsha Trailer Wiring Circuit Tester Activate Trailer Brakes
  • The Tekonsha Trailer Wiring Circuit Tester # 8010 does send power back to your trailer brakes to make sure the circuit is working correctly. This will apply your trailer brakes at short intervals and will let you know the condition of your wiring. This means that the tester essentially tells you whether or not your brakes are working, however if something is wrong with them mechanically (as in they need to be replaced because or wear) that will need to be determined by physically inspecting...
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  • Is There a Factory Brake Controller Tester Device
  • The Current Monitor with 7-Blade Connector part # 6565 is what we use in our shop when testing trailer brake controllers. It has brake magnets inside so there won't be any issues with trying to trick the vehicle into thinking a trailers is connected. It will read the voltage being sent to the trailer brakes. It also test the lights and battery charge line circuit. The other option which simply lets you know voltage is being sent, not how much is the Tekonsha 7-Way, RV-Style Tester for...
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  • Troubleshooting Trailer Brakes Not Working On 2017 Forest River Wolf Pup 16BHS
  • I would start with doing a few troubleshooting steps to see exactly what the issue is, and where you are losing power. In the junction box on your 2017 Forest River Wolf Pup 16BHS there should be a blue wire that is the brake output wire that is what sends power to the brakes for them to apply. When you apply the brakes using the manual override have a friend test this wire with a circuit tester like # 40376 to see if power is making its way there. If you have power then keep applying...
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  • Converter For Motorcycle/Trike With 6-WAy Separate Lighting & Trailer With Combined Lighting
  • Ok, we can help you out here to get all of the functions working; there isn't an adapter available that is going to do this since your trike has separate lighting and your camper trailer has combined. What you will need is a converter for your trike, and you'll need to cut off the 6-way and wire in a 4-way; here are the parts: - Roadmaster Brite-Lite Wiring Converter # RM-732 - 4-Pole 60" Long Vehicle End # 18002 - Cordless Circuit Tester # PTW2979 You'll need the circuit tester...
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  • Plug-In Location For 4-Way Wiring Harness on 2022 Subaru Outback
  • Yes, the 2022 Subaru Outback - including the Premium - does have a location to plug in the 4-way. It is under the rear threshold plate in the cargo area, near the passenger side. I have added a photo for you showing the location, and you can get to it easily by using Trim Pad Remover # ALL648544. The correct 4-way wiring harness for your 2022 Subaru Outback is the following: - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118467
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  • Weak Trailer Brakes On Trailer Towed by Ram 3500 or Chevy 2500
  • Which brake controller are you using? What are the years of the trucks? If using factory integrated brake controllers you may need to adjust the gain (same on aftermarket controllers) to increase the output voltage. Trailer brakes work on varying voltages. At 4 to 5 volts that is not quite half of full power. At 12 volts the magnets would be fully energized. Also, where are you testing for voltage? Adjust the power output on the brake controller to the maximum and then have someone fully...
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  • Troubleshooting Brand New Trailer with Weak Electric Brakes
  • Since the trailer is brand new most likely the issue is that the brake assemblies aren't adjusted properly as this is the most common cause for weak brakes on a new trailer. If the assemblies are self-adjusting they will get tighter with every application of the brakes so you can apply the manual override lever several times and they will get tighter each time. Or you can manually adjust them tighter to get them more sensitive. I have attached a great installation video that you...
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  • Locating Brake Switch Wire on 2016 Mazda CX-9
  • To locate the correct brake switch wire on your 2016 Mazda CX-9, you will need to use a circuit tester like # PTW2993 to test each of the 3 wires you mentioned in your question. You are looking for the wire that shows power only when the brake pedal is depressed and not for any other function like turn signals or running lights. I was not able to locate what color this wire might be in your Mazda CX-9, however testing the wires is still the best method as vehicle manufacturers tend to...
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  • Will Trailer Brakes Lock Up when Connected to 2003 BMW X3 that Does Not have a Brake Controller
  • The brakes on the trailer will not lock up. they actually won't do anything at all (unless something was miswired). To activate the brakes you would need to have a brake controller. Without one the brakes will not function. Because of how the wiring works on a BMW the recommend brake controller for the 2003 X5 with factory 7-Way is actually the Prodigy RF # TK94FR which mounts to the trailer. If you do want the brakes to function in the future, which I do recommend as it will be much...
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  • Finding Brake Switch Output Cold Side for Electric Brake Controller on 2010 Jeep Wrangler Unlimited
  • The cold side of the brake switch is located behind your brake pedal. You will need to use a circuit tester like # PTW2993 to test the wires to the switch. There will be a constant power 12v that will come into the switch and the wire you are seeking is one that has no signal when the brake pedal is not pressed, but has the signal when the pedal is pressed. So it is cold (not showing power) when the pedal is up and is hot (showing power) when the pedal is pressed. I've attached...
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  • Trailer Wiring Circuit Tester Comparison
  • Both the Tekonsha Trailer Wiring Circuit Tester # 8010 and the Hopkins Tow Doctor Trailer End Test Unit # HM50928 are for testing the wiring of your trailer. Both will work with incandescent and LED lights. However, the Hopkins will not display amperage for LED lights. They both connect the same by plugging your trailer's wiring harness into the unit. The Hopkins includes connectors for a 7-blade, a 4-pole, and 6-pole round. The Tekonsha has the 7-blade standard. If you need a...
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  • Troubleshooting 7 Way Wire Functions on a Camper
  • It sounds like your wires are most likely all wired up correctly. If you are wanting to verify that, I recommend the Pollak 7-Way to RV Socket LED Circuit Tester # PK12741. A more likely culprit is probably damaged wiring somewhere along the circuit or possibly some corrosion built up around the running lights pin on the trailers 7-way. If you have a damaged wire you would want to splice in new wires individually for the ones damaged on your 7-way wiring or splice in a jacketed 7-way bundle...
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  • Parts Needed to Re-Wire Trailer With 7-Way & Electric Brakes
  • We can get you set up to re-wire your trailer with a 7-way, and while there isn't a complete kit, we do have everything you need, which I'll go ahead and list out for you. - Junction Box # 3375601100 - 7-Way Connector # H20046 - Ring Terminals # 44-5310A - Brake Wire (Sold by the Foot): 10 Gauge Primary Wire # 10-1-1 - Wires for Lights (Sold by the Foot): 14 Gauge Primary Wire # DW02412-1 - 12-10 Gauge Butt Connector # 05732-2 - 16-14 Gauge Butt Connector # DW05714 -...
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  • No Power to 7-Way Trailer Connector on a 2004 Ford F-150
  • It sounds like a possible tow package fuse has blown on your 2004 Ford F-150. You will want to use the truck owners manual to find the locations of all fuses/relays associated with the tow package wiring to check them. The 12 volt pin on a 7-Way does not affect the regular trailer lights and the fact that everything stopped working with the interior lights is what makes me think the issue is related to the tow package fuses (specifically the one that controls the 12 volt circuit on the...
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  • Troubleshooting Non-Functioning 12V Trailer Power Feed on 2016 Silverado 2500
  • The circuit on a 7-way that brings 12V power to the trailer, for topping-off the trailer battery's charge or for operating interior trailer lights, is carried on the pin at the 1-o-clock position as you look at the socket on the back of the truck. (Please refer to the linked photo). You can use a simple tester like # 40376 to see if the 12V auxiliary power feed is active. If not you may only need to install a missing fuse. According to my research the trailer battery fuse is in position...
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  • Can I Use the 7 Way Trailer Connector Vehicle Tester on the ETBC7L
  • Yes, you can use the 7 Way Trailer Connector Vehicle Tester # TR20117 but since the # ETBC7L kit does not have a functioning brake controller wire that light will not show up as working; just something that should be noted when testing but it won't stop it from telling you what pins are working otherwise.
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  • Circuit Tester for 7-Way Trailer Connector that Includes All Circuits
  • The 7-way circuit tester part # 6562 tests all of the 7-way circuits including the two you mentioned of brake output and 12 volt accessory. I attached a review video for this for you to check out as well.
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  • How to Bypass 12 Volt Trailer Wiring Accessory Circuit Not Functioning on New Ford Truck
  • It would not as it's only really designed to see if voltage is present. The new Ford trucks need a specific amount of load on the circuits to activate the 12 volt circuit which is pretty annoying. If you are looking for a way to bypass that let me know as we can help.
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  • How to Test Brake Magnets on a Dexter 7,000 Lb Axle
  • I have attached a help article that will walk you through step by step the various processes to troubleshoot brake magnets. In order to perform these tasks you are going to need a multimeter like part # PT89ZR instead of a test light like part # 40376. Then depending on where the problem originates, you can use part # 10-1-1 if you need to replace any of the wires and part # BP01-225 if you need to replace any of the magnets.
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  • Tekonsha TR20117 or 6562 7-Way Trailer Connector Tester for 2017 Ford F-350
  • You would need to go with the # TR20117 because your vehicle was manufactured after 2013. I believe the factory brake controllers in the later model Ford trucks were proportional, which means that you won't get any output on the brake pin when the vehicle isn't in motion, only when the manual brake switch on the controller is activated. The easiest way to test the wiring on the trailer is to use a 12 volt battery, ground the negative terminal to the trailer frame and apply voltage to...
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  • Replacement Parts for a Fan-Tastic Vent Fan 6600R
  • I called my contact at Fan-Tastic Vent and they informed me that there are no longer any replacement parts available for the Fan-Tastic Vent Fan 6600R due to its age. I would first check to make sure none of the wires are pinched and that the lift motor is receiving power by probing the wires with a circuit tester like part # 40376. If it turns out that it is not a pinched wire and the motor is bad then you will need to replace the entire unit. For a direct replacement, I recommend the...
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  • Electric Brakes Not Working when with Factory Brake Controller on 2013 Silverado and 2014 Yukon
  • Since we know that the trailer brakes do work since they work with your 2011 Ford F-150, the issue must be with the factory brake controllers in the 2013 Silverado and 2014 GMC Yukon XL Denali. The fact that they are GM vehicles is a clue. Sometimes, for whatever reason, GM will not make the tow package fully functional at the factory. You would have to make some connections under the hood. Even though I have not heard of this being an issue on models with factory installed brake controllers,...
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  • BL-OC Error Code On Air Lift WirelessAIR Compressor
  • If you are receiving a BL-OC error code on your Air Lift WirelessAIR Compressor System for Air Helper Springs # AL72000 which is no longer available from the manufacturer, that is indicating that there is a blockage in the system. Start by tracing the air line from the compressor to the air bags and check for kinks or areas where the line might've become loose. Next, check that the compressor is receiving 12V by using a multimeter like # PT89ZR and check the leads coming off the...
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  • How to Connect Atwood Electric Motor for R.V. Landing Gear To Switch Already On Trailer.
  • On the Atwood Electric Motor for R.V. Landing Gear, one set of red and black wires on the switch will be wired to the vehicle battery. The red wire should be wired with an inline fuse holder to the 12 volt positive battery terminal and the black wire is wired to the negative battery post or a clean, paint and corrosion free chassis ground. The second set of red and black wires on the switch will attach to the motor leads. The red wire goes to the red motor lead and the black wire goes...
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  • No 12 Volt Power at 7-Way on a 2017 Ford F-350
  • In order for the 12 volt circuit on the 7-way in your 2017 Ford F-350 to receive power, you will need to activate this in the information center on your dash. Please note that once this is done the 12 volt circuit on the 7-way will still not show power until the trailer is connected. If you have activated the 7-way in the information center and are testing the 12 volt power while a trailer is connected and still not getting a reading then you may want to check the fuses in your fuse...
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  • Is There a Tester for Trailer Side 7-Way
  • There is a tester for a trailer side 7-way (the standard blade-style, which is what I think you were referring to by flat 7-pin tester), though not a tester that you can plug in between your vehicle 7-way and trailer side 7-way; you would need to get two separate testers, one for each. For the trailer side tester, the only option is the Tekonsha Trailer Wiring Circuit Tester # 8010. This is a comprehensive tester and all you have to do is plug your trailer's standard 7-way into it...
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  • No 12 Volt Power at 7-Way Trailer Connector on a 2018 Ford F-350
  • In order for the 12 volt circuit on the 7-way in your 2018 Ford F-350 to receive power, you will need to activate this in the information center on your dash. Please note that once this is done the 12 volt circuit on the 7-way will still not show power until the trailer is connected. Now with that being said, there is not a direct correlation between the 12 volt circuit on the vehicle's 7-way and the landing gear legs on your 5th wheel trailer. The 12 volt circuit on the 7-way would...
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  • Brake Controller Not Getting Power on a 2010 Ford E350 Van
  • The first place that I recommend checking when you lose power to something would be your fuse box. A blown fuse can cause the power to not reach your brake controller. If your fuses look okay then it might be easier to find a wire that is connected to your battery and trace it back to your brake controller. If you can find the right wire this way, then you can check for any signs of corrosion, exposed, or damaged wiring. As for the connector in the picture that you sent, there are no...
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  • 12-Volt Feed to Trailer Connector on 2016 Newmar Bay Star Sport 2903 Motorhome Has No Power
  • Did you mean to say that your motorhome was built on the F550 chassis? According to the literature I found online, that's the chassis that Newmar built the 2016 Baystar Sport 2903 on. If that's the case, you've likely missing the fuse that powers up the 12-v feed to the 7-way that many use to keep a trailer battery maintained. According to the owner's manual, the fuse should either be a 40A in location # 10 or a 25A in location # 90. These can be found in the power distribution box in...
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  • How To Find The Correct Brake Signal Wire When Installing A Brake Controller
  • It sounds to me like you are not splicing into the correct stop light circuit. The correct stop light wire you will need to attach the red wire from the brake controller to on your 2017 GMC Acadia is white. To test this, you will want to use a circuit tester like part # 40376. The first thing you will need to do is attach the circuit tester to the correct white wire located behind the driver side kick panel. Once attached, depress the brake pedal and the circuit tester should illuminate....
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  • How to Inspect/Test Electric Trailer Brake Magnets
  • For starters, you'll want to give the magnets a good looking over. If you look at the front face of the magnet that rides against the armature surface of the brake drum, you should not see any of the copper wiring that's encased within the magnet. If you do, it's a sure sign that the magnets need replacing. Then, use a multimeter like # PTW1714 and check the wires feeding the magnet while a helper holds the manual brake lever down on your brake controller. You should be seeing at least...
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  • How to Test a 7-Way Trailer Connector on a Tow Vehicle
  • Yes, in order to test the trailer connector on your tow vehicle you can use a standard circuit tester or a plug in tester like the 7 Way Trailer Connector Vehicle Tester part # TR20117. This is going to make testing the wiring on your tow vehicle simple. All you need to do is plug the tester into the trailer connector and then activate the signal while checking for the red light on the tester. If the red light appears you know that circuit is active but if not then you know there is an...
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  • Interior Lights Not Working on a 1998 Sooner Horse Trailer
  • If all of the other functions on your trailer are working correctly, then you most likely have a short or a bad ground on the wiring that your interior lights are connected to. You can trace it all the way to the trailer connector on your horse trailer and look for any places where the wire might be bent, damaged, corroded, or exposed and replace it or fix it. Another way to test and see if that is the problem is to test the pin on your tow vehicle side connector that is used for 12V...
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  • Troubleshooting Lost Power on a 1993 Fleetwood Limited RV Outlet with Generator
  • From the sounds of the issue, there does not appear to be a problem with the controller or the converter. In order to find the cause of the issue, the best way to proceed is to plug into a shore power source and trace the wires all the way to the outlet that has no power. This sometimes is the case when an aftermarket generator is added to an older model RV like your 1993 Fleetwood Limited. You can test the wiring trail throughout to test to see if there are any shorts with a circuit tester...
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  • Installing an Electric Trailer Brake Controller in a Class A Motorhome with Air Brakes
  • From my research your 2007 Fleetwood Revolution LE 40e motorhome has air brakes. However, you can still use an electric brake controller. To install the controller you'll need to wire it into your RV. The black wire connects to the positive post of the battery, the white to ground, the blue wire to the RV's trailer connector in the rear, and the red wire connects to the stop light switch. To find the correct stop light switch wire use a tester, like part # 40376, and find the circuit...
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  • Brake Controller Applies Trailer Brakes When Headlights are Turned On
  • The first thing to check would be to make sure the brake controller is in the right port on the block underneath the dash. It should be the second port from the left on the top row. I have included a link to the instructions for your particular truck. It is possible that your truck did not come with the appropriate wiring to the rear of the vehicle. If the brake controller is in the correct port and it still does not function properly, then you will have to hardwire the brake controller...
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  • How to Activate Trailer Tow Charge Circuit in 2017 Ford F-250
  • All 2017 F-Super Duty vehicles equipped with a factory trailer brake controller (TBC) utilize a trailer module (TRM) which initiates the trailer charging system. For trailer charging to operate, the TRM must detect a trailer is connected and a brake pedal input before charging will be present at the trailer connector. Adding the trailer battery charge relay and fuse into the battery junction box are NOT required to operate trailer charging with a TRM. This is covered in Ford document...
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  • Determining Color Wire for 7 Pin Trailer Wiring Harness on 2005 Ford F-150
  • On your 2005 Ford F-150, I recommend using a circuit tester like # 40376 to determine the function of the orange and black/pink wires. I recommend first checking the orange wire which I believe is the 12V hot wire from your battery. This should immediately lights up. The black/pink stripe wire is what I assume is the reverse light wire. Test this and you should get no power, then when you shift your vehicle into reverse, this wire should light up. If this is the case then you will...
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  • Recommended Wire Clamps To Keep Interior LED Wiring In Boat Trailer Secure
  • I recommend the CE Smith Trailer Wiring Clips - Frame Mount - Zinc Plated Steel - Qty 10 # CE16867A which will clip to any supports inside of your boat trailer and keep the wiring for your LED lights nice and clean. If there is spots you are needing a holder but there is no area for the clip to attach I recommend using some silicone to hold the wires in place. I included a video of the # CE16867A for you to take a look at.
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  • Trailer Lights Blowing Fuse When Running Lights Are Activated
  • This sounds like you have a short circuit somewhere in your wiring. The first thing you'll want to do is, disconnect the trailer from the tow vehicle. Next, switch out the blown fuse with a new fuse and use a circuit tester like # PTW2992 to test the vehicle side connector while you test the running lights. If your circuit tester shows power and the fuse does not blow, then the issue is with your trailer. If it does blow a fuse, your issue is with the vehicle. If this is the case, you'll...
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  • Hardwiring a Brake Controller on a 2001 Chevy Blazer without a Factory Tow Package
  • The reason you cannot find the 12 volt power and the electric brake wire is because you have to hardwire them yourself. On your 2001 Chevy Blazer, you will have to hardwire the vehicle to install a brake controller. Hardwiring a vehicle may seem like a difficult task, but it really is not too hard. I can guide you through the process. You will need three items in order to install the brake controller. First, you will need the brake controller itself. Second, you will need a 7 and...
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  • Troubleshoting 2013 GMC Sierra 3500 Brake Controller Not Working with Brake Pedal
  • Most likely you have an issue with the stoplight circuit of your 2013 GMC Sierra not able to tell the brake controller that the brakes are being applied. For your generation of truck this is commonly due to the third brake light or CHMSL fuse being blown. You can check this quickly by pressing the brakes and seeing if the third brake light comes on.
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  • Base Functions of the Hopkins Tow Doctor
  • The Hopkins Tow Doctor, part # HM50928 is used to test a trailer's brake and light wiring. It shows if there is a short circuit, overloaded circuit or low battery. You'll need to use a 12 volt or higher powered battery to correctly output a test signal. You can even use a jump box to make the entire kit superbly portable. The kit will test the tail lights, the left and right turn signal and the brake lights, plus any running lights with a simple button press. It also provides a readout...
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  • How To Test Wires By Function On 2003 Chevrolet Silverado 2500
  • You can use a circuit tester like part # 40376 to check the wiring on your 2003 Silverado. Have someone run through the functions while you test each wire. Then label the wires so you can attach them to the correct pins on the trailer connector. Here are the factory wiring harness colors for Chevrolet. Keep in mind the colors may vary so testing them with a circuit tester will really help. Red - 12V power Light Blue - Stop Light Black - Ground Dark Blue - Trailer Brakes Brown -...
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  • Troubleshooting Tekonsha P3 Brake Controller Not Recognizing Trailer
  • For starters, the fact that you aren't getting output with the brake pedal doesn't indicate a problem. Proportional controllers like the Tekonsha P3 won't output voltage with the brake pedal unless the vehicle is in motion. I'd begin by rebooting the controller. Unplug the controller at the rear, then plug it back in after a minute or two. If the controller is reading 'NC' with the trailer plugged in, it typically means that the slight test voltage the controller sends out to sense...
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  • Trailer Brake Controller is Not Working on a 2005 Toyota Tundra
  • If your 2005 Toyota Tundra came with a factory installed 7-Way trailer connector then you should be using the pig tail # 3040-P for a Tekonsha brake controller like the Prodigy that you have referenced. The key is that the additional white ground wire must be attached to a clean and corrosion free bare metal surface because the Toyota ground is not sufficient. If everything is hooked up correctly then check the owners manual for the locations of fuses and relays related to the tow package...
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  • Troubleshooting Fantastic Vent Fan with Rain Guard and Thermostat
  • Your Fantastic Vent model 8100ts doesn't have replacement parts available, so I recommend using a circuit tester like # PTW2993 to check for power functions. I reached out to the manufacturer and in addition to this, they said to check the circuit board. You may need to simply clean it and add some dielectric grease like # 11755 to help with electrical connection and keep dirt and moisture out. If there are scorch marks on the circuit board, then the board is fried and the entire unit...
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  • Tekonsha Prodigy RF Wireless Brake Controller Troubleshooting Connection With 2005 Ford F-150
  • It sounds like you may have a short in your wiring system on your 2005 Ford F-150. I recommend using a Circuit Tester # PTW2992 to test the 7-way vehicle connector. Inside the 7-way it is going to be the blade that is in the 1 o'clock position. with the ignition on it should be receiving battery power. Be sure to also check the ground terminal in the 7 o'clock position for a good ground connection. If you do not have power you will want to check the fuse in the engine compartment location...
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  • How To Connect Trailer Brake Controller To Cold Side Of Stoplight Switch In 2020 GMC Terrain
  • You are correct. On your 2020 GMC Terrain connecting a trailer brake controller harness is a bit different as you cannot just connect the red stoplight wire directly to the cold side wire of the stop light switch. The work around for this is you will need to pick up the cold side wire in the BCM (Body Control Module) of your Terrain. The BCM is located between the emergency brake pedal and brake pedal about where your left knee is when sitting in the driver seat as shown in the included...
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  • How To Install A Brake Controller on a 2009 Ford F-150
  • Installing a brake controller system on a 2009 Ford F-150 is very simple thanks to the brake controller port they provide. The port is in a funny location but you simply plug in the brake controller and you are done. The most popular brake controller we carry is the Tekonsha Prodigy. For a Prodigy for your truck, you would use part # 90185 and adapter # 22292 and it will include a wiring harness that will allow you to simply plug the controller into the truck. No cutting, splicing or...
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  • Troubleshooting No 12V Power on 2017 Ford F-350 7-Way Connector
  • If you aren't receiving any power at the 12V pin location on your truck's 7-Way connector, I recommend making sure that there is not a blown or missing fuse. I took a look at the online owner's manual for your 2017 Ford F-350 for the related fuse and relay locations. Check to make sure the 30 amp fuse in the 27 position and the relay in the number 37 position are present and in good condition. These are located in the power distribution box in the engine compartment and are specifically...
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  • 2006 Dodge Ram 1500 with 7-Way Connector and Electric Trailer Brake Controller Light Not Functioning
  • I was able to pull up your purchase histrory and see that you have the Tekonsha Voyager Trailer Brake Controller - 1 to 4 Axles - Proportional # 39510. On this brake controller, as you will see in the attached video, you won't get a light until you plug a trailer in. If you put an incandescent circuit tester like # PTW2993 on the brake controller pin on your trailer connection, it should draw enough power for that connection to be seen without a trailer connection and you should see...
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  • Troubleshooting Lippert Ground Control 2.0 Leveling System Error Code
  • There are a couple of things as I talked with my contact at Lippert. You will need to follow this system perfectly of the error will not clear. You need to extend the front jacks 6 inches, then the rear jacks 6 inches, and then press and hold the retract button until the jacks are all retracted. This should clear the error. If it does not, then use a multimeter like # PT89ZR check to make sure that left front jack is getting the proper battery voltage. If it is under 12V then it...
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  • Locating Cold Side of Brake Switch Wire on 2016 Mercedes-Benz Sprinter
  • In order to determine the correct wire in your 2016 Mercedes-Benz Sprinter to connect the brake controller red wire to, you will need to find the cold side of the brake light switch. Using a circuit tester like # PTW2993, simply test each of the 4 wires you mentioned to see which wire receives power only when the brake pedal is pressed, and not during any other function such as the turn signals or headlights. From what I could find, it appears the correct wire on your 2016 Mercedes-Benz...
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  • How to Get Constant Power to a Vehicle's 7 Way Plug
  • You can definitely run constant power to the 7 way if needed. All you would need is a length of wiring and a circuit breaker. Twenty feet of the Deka 12 Gauge Primary Wire # 12-1-1 would give you a bit of excess, but it never hurts to get a little more than ending up needing a little more. I highly suggest going with a 40 amp circuit breaker since this will be installed directly in line from the battery to the 7 way plug. You will need to remove the 12 volt power wire from the 7 way,...
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  • How to Access 5th Wheel Taillight Wiring for Installing Wiring Harness
  • Usually it will be necessary to remove interior trim panels to access the taillight wiring of a 5th wheel. If your particular trailer's taillights offer access from the exterior then you'll have an easier time getting to the wiring to allow you to test it for function. It is worth contacting the trailer maker with your VIN to see if they can offer you guidance for accessing the wiring. You will want to use a tester like # 40376 to confirm the signal carrier on each RV taillight wire...
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  • Trailer Brake Controller Installation in 2017 Mercedes-Benz Sprinter 2500
  • There is no plug-and-play brake controller harness for the 2017 Mercedes-Benz Sprinter 2500 so brake controller installation will be a hard-wire process. Under the driver's seat there should be a green plug. The wires to this plug can be tested with a circuit tester like # 40376 to confirm their function since vehicle wire colors are not always consistent. A brake controller like the Prodigy P2 # 90885 has 4 wires that require connection to the Sprinter. The black wire is 12V...
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  • How To Determine How to Wire New Lights
  • Wire colors are not universal so the only way to determine how to wire up your lights is to use Circuit Tester # PTW2979 to find out the functions of your wires and hook up your lights accordingly. I could not find an order number for you so I can't determine which lights you purchased from us that you are looking for specific help with. For example, the LED RV Tail Light # RVSTLB61 and # RVSTLB60 have a white wire for a ground wire, a green wire for the tail light and black wire for...
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  • Wiring Wood Chipper 7-Way Connector To Match 7-Way Connector On 2003 Dodge Dakota
  • If the plug on the wood chipper and the plug on your Dakota do mate it is a simple matter of making sure the plugs are wired the same. You can use a circuit tester like part # 40376 to test the pins on the truck first. Have someone sit in the cab of the truck and run through the functions while you test the pins on the trailer connector. Then use a separate 12V power source and with the trailer disconnected, test each of the pins on the trailer. For typical 7-way trailer wiring...
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  • Finding Brake Light Wire On 2011 Volkswagen Golf When Installing Brake Controller
  • Some vehicles do make it tough to simply wire into the brake light switch for the brake controller and your Golf may be one of those, but I do have a solution for you. I called my contact at Tekonsha and they told me that you will want to find the wire that leads to the third brake light. Use a tester like part # 40376 and find the wire that only shows power when the brake pedal is pressed. You would then attach the red wire from the brake controller to that wire. Although they were...
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  • Why Is My Brake Controller Displaying Trailer Not Connected When A Trailer Is Connected?
  • There could be a couple of reasons why your brake controller is displaying that the trailer is disconnected when the trailer is connected. What I would first check is the vehicle and trailer side connectors for any dirt or corrosion as this is a fairly common reason why things malfunction. If you see any dirt or corrosion, clean out the connectors, and recheck your brake controller for proper functionality. If your connectors are clean, or you just cleaned them and rechecked, and...
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  • Fifth Wheel Trailer Brakes Not Braking Enough with Controller Turned Up All the Way
  • Ideally, the trailer brakes would be braking in such as way as you cannot tell they are braking but I do not think that is the issue here. It sounds like there may be some voltage loss somewhere. With the controller output set up correctly and the brakes adjusted, you can check a few other things to determine where the problem is. Start by severing the blue wiring from the back of the controller a few inches. Use a circuit tester like # 40376 if needed to test the end coming from the...
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  • Troubleshooting Brake and Turn Signal on Trailer Not Working
  • Even though the fuses are good, I do recommend that you start by checking the pin in the 3 o'clock position (when looking at the front) on your 2003 Chevy Silverado's 7 way connector. I would start just by making sure that the pin is free of dirt, debris or corrosion and clean it off as needed. Then, you'll need a circuit tester like the # PTW2993 in order to verify that pin is receiving power when the turn signal and brakes are engaged. If there is not power, the issue is going to be on...
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  • Troubleshooting Trailer Brakes Getting Only 8 Volts Of Power
  • If you are only getting the 8 volts when you pull the pin using a meter like # PT89ZR, that has nothing to do with your brake controller as the breakaway battery is powering that from the trailer itself. You can confirm your brake controller is working properly by checking the 5 o'clock pin on your 7 way with your meter when the trailer is disconnected while having someone hit the manual override on your brake controller. You most likely have a bad ground in your wiring on your trailer....
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  • Where Is Fuse Located For Trailer 12V Power For 2004 Chevrolet Silverado
  • I have attached a drawing that shows how the 7-way wiring should be run. As the drawing shows, the Black 12V wire coming from the back of the trailer connector is run to the positive battery post with a 40 amp circuit breaker. Another way to attach the Black wire is to attach it to the forward-most positive terminal on the fuse block. If you attach the wire to the fuse block you will also need to use a 40 amp fuse in the slot closest to the terminal. I did some research of the fuse...
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  • Troubleshooting Right Turn Signal Flashing Twice as Fast As Other After Harness Installation
  • The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56272 should not have changed the speed of your turn signal, so I recommend using a circuit tester like # PTW2993 to test the wires. Next I recommend checking the connections for bent pins and using a little dielectric grease # 11755 on the connections to give you a connection free of debris and moisture. Then doublecheck the ground connection on the harness. Make sure the connection is bare metal to...
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  • Troubleshooting Fuse Blowing and Wiring Heating Up for Left Side Lights on Trailer
  • It is likely that you have a short in the wiring. Although, it is always a good idea to check your other ground connections. Since it is a new wiring harness that is probably not the problem. Start by checking your 7-way using a circuit tester like the # PTW2993. It would also be a good idea to clean your 7-way connections while you're at it since corrosion and debris can cause problems. If everything checks out for the left side lights then it is a problem on the trailer. If it...
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  • Electric Brake Controller Installation on a 2017 Cutaway Chevrolet 4500 RV
  • We haven't had the chance to install a brake controller on a 2017 Chevy 4500 Cutaway but it's very likely to be the same. The first difference I would be careful of though is the wiring coloring. Before assuming the wire color is all the same use a circuit tester, like part # 40376, to test each wire you find for function. Vehicle manufacturers aren't very consitent on wire colors; especially from year to year. If you need other components, like a trailer hitch or 7-way connector...
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  • Troubleshooting Weak Trailer Braking and Low Voltage at Connector
  • With the brake controller set to its maximum setting, you should be getting 12 volts at the trailer connector when applying the manual lever. Since you are only getting 8.5 volts at the connector, the issue you are having is likely somewhere on the vehicle side. Start by tracing the wiring back from the 7-Way connector and along your tow vehicle, checking for any damaged or corroded sections, fixing as needed. If all the wiring looks okay, I next recommend checking the brake controller...
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  • How to Find the Cold Side Brake Switch Wire on 2017 Chevrolet Colorado
  • The best way to find the cold side brake switch wire in your 2017 Chevrolet Colorado is to simply test the wires using a circuit tester like # PTW2993. You will want to find the wire that only has power when the brakes are applied in the vehicle. Depending on what you are installing, you may also be able to use the bundle of wires that should be located behind the dash, to the left of the emergency brake pedal. This bundle is typically used for installing a brake controller. Looking...
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  • What are the Different Circuits on a 4-Way
  • The jacketed circuit is the ground. The one right next to that one is the tail light circuit, next to that one is the left turn circuit. And then the last one on the end is the right turn circuit. Check out the picture I attached to see the circuits labeled. I attached an FAQ article on trailer wiring that you might find informative also.
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  • Troubleshooting 5th Wheel Wire In Junction Box That Isnt Connected And Error Message
  • On your 2014 Open Range 5th wheel trailer, the color of wire unfortunately doesn't help. You will need to test the wire for function. Because you have the lighting functions, you may have a ground or reverse function. You may also have a brake that is not fully functional. I recommend tracing that wire and using a circuit tester like # PTW2993 to determine the function. I recommend connecting that single wire to a battery to see if you can quickly determine function.
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