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Expert Answers about Wiring


  • Troubleshooting Trailer Turn Light Signals
  • Trailer wiring is set up to have running lights on their own circuit while the trailer's brake lights and turn signal lights share a common circuit, one on each side of the trailer. In standard 4-pole wiring the RIGHT brake and turn light signals are carried on a green wire; the LEFT side signals are carried on a yellow wire. You can see this in the photo I linked for you which shows a trailer-side 4-pole connector. The best way to test things is to disconnect the trailer from the...
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  • Can 5th Wheel/Gooseneck Wiring Harness be Installed on GMC Canyon with Factory 7-Way
  • A 5th Wheel/Gooseneck Wiring Harness that is confirmed to fit the 2018 GMC Sierra, such as the Bargman # 50-97-410, will indeed also work on your 2018 GMC Canyon as long as it is equipped with the factory 7-Way connector. This harness will simply plug in between the OEM harness on the truck and the factory 7-Way, retaining the use of the original 7-Way while also providing a connector in the bed of your truck. I have attached the installation instructions for this harness that you can...
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  • Comparing Hopkins 8 Foot Long Trailer Side 7-Way Connectors
  • They are basically the same. Harness # HM20041 looks to be replacing H20046. The manufacturer no longer has a listing for the 20046 harness. Everything else is the same as far as length, wire gauge, and design.
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  • Troubleshooting No Running Lights on Trailer with 2017 Ram 2500
  • I took a look at the online owner's manual for your 2017 Ram 2500 and did find a couple additional fuse locations that you can check that are related to the trailer signal lights. The F11, 30 amp fuse that you mentioned changing actually looks like it is for the integrated brake controller on the truck. I recommend also checking the F29, 20 amp blue fuse,along with the F30, 30 amp pink fuse. These are both for trailer lighting so you will want to make sure they are present and in working...
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  • How to Choose the Correct Truck for Towing a 5th Wheel
  • As long as the towing capacity (Gross Combined Weight Rating (GCWR) - Gross Vehicle Weight Rating (GVWR)) of the tow vehicle exceeds the gross trailer weight (GTW) of your 2007 DRV Mobile Suites 36TK3 then you can safely tow it. I think it goes without saying that a 1 ton truck will have a greater towing capacity than a 3/4 ton but the best option for you will depend on your wants/needs. Please keep in mind that the closer you are to the vehicle's towing capacity, the harder the vehicle...
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  • Troubleshooting Trailer Turn Signals That Do Not Operate When Headlights Are Turned On
  • The problem you describe sounds like a classic case of a bad ground connection on either your vehicle's trailer wiring harness or the one on the trailer. When you turn on your vehicle headlights you also activate the trailer's running lights. Since these lights remain on continuously they draw more current through the trailer wiring. If the ground wire connections are loose or corroded the wiring will not be able to pass all of the required 12-volt power the lights need and this can...
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  • Troubleshooting No Running Light Signal on Factory 7-Way on 2013 Dodge Ram 2500
  • If the 7-way trailer socket pin for running lights on your Dodge 2500, the one at the 11:00 position as you look at the socket, has no signal and you have already checked the related vehicle fuse 29 (a 20-amp yellow) for that function then I suggest you test the wiring leading to it to find the point where the signal is lost. Apply your tester, one like # 3808 or # 40376, to the wiring that leads to the connector and move forward until you find the point where the running light signal...
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  • How to Test to Determine Unknown Wire Color Functions of Trailer Wiring
  • Orange and gray are not standard trailer wiring colors so you'll need to do some testing to verify what those circuits carry. What you'll need to do is use a jumper wire from the positive pin of a 12 volt car battery to apply voltage to all of the wires to see which trailer circuits apply. The one that sparks when the connection is touched is the ground. For a new 7-way though we have the # H20046 which I attached a chart that shows how this gets wired as well by color.
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  • How to Pick Out Replacement Hub and Brake Assembly for 1990 Salem Cobra Travel Trailer
  • In order to pick out the correct hub assembly for a trailer you are going to need know a few key pieces of information. The first thing you will need to know is the bolt pattern of your hubs. This is so you get a hub that is compatible with your wheels. I attached an FAQ article on determining bolt pattern for you to check out. Next thing you will need to know is what spindle you have on your trailer. In order to do that you can either get the inner and outer bearing numbers from a hub...
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  • Troubleshooting Trailer Brakes that Lock Up When Using 6-Way Adapter
  • Your problem is related to the 7 to 6-way wiring adapter. The issue is that there are two ways that a 6-way is typically wired and the only difference is that the 12 volt accessory circuit and the brake output circuit are swapped. Anytime we see trailer brakes immediately locking up when connected and there's a 6-way involved this is the issue. What you need to do is swap the two circuits on the 6-way adapter or the 6-way connector and you'll be good.
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  • Trailer Side 4-Way Recommendation
  • Since the wiring bundle you have is cut off you'll have to splice to whichever style of connector you have. For a trailer side 4-way we have the part # A10-4404VP which you'd have to match color for color to the harness you sent a picture in of.
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  • 7-Way Trailer Wiring Recommendation for 2003 Land Rover Discovery II
  • We have trailer wiring solutions for your 2003 Land Rover Discovery II but they are hardwired harnesses with like the part # 119147KIT that provides the taillight signals that you'd need to start with. Then from there you'd need to convert it to a 7-way you'd need the part # 37185 which is the style that uses blades for the pins. If you need a 7-way with pins you'd also need the adapter part # 47595. We do not carry any 6-way flat connectors so I am fairly certain what you are referring...
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  • Troubleshooting Excessive Bucking While Towing a 5th Wheel Trailer
  • My first thought is that something is going on with the wiring on either the truck's brake output circuit or on the trailer's brake wiring. I would start by inspecting and cleaning both the trailer and truck's 7-way connectors. Then use a circuit tester like # 3808 and test the truck's at the 5 O'clock pin while someone engages the maual override. With a factory integrated controller I doubt this is your issue but this'll rule it out right away. I'm thinking the issue is on the trailer....
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  • Troubleshooting 5th Wheel Gooseneck Wiring Installation on 2004 Ford F-350 with Factory 4-Way
  • For your 2004 Ford F-350 you will utilize your factory 4-way and then wire in an adapter and the wiring for a brake controller. For your application, I recommend the Hopkins Endurance Multi-Tow 4-Way Flat to 7-Way RV Trailer Adapter w/ 4-Way Vehicle End Plug # HM47180. You will plug your 4 way into this, then use a screw to ground the white wire with ring terminal. Then you will use the # 12-2-1 wire to run your 12V power wire to the red wire, the brake controller output wire to the...
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  • Trailer Disconnected Message When Driving
  • I do not know what brake controller you have, but for an aftermarket brake controller there are steps you can take which I'll outline for you. You will need to find out if the issue is on the brake controller, truck, or trailer. To test the brake controller, sever the blue wire a couple inches from the back of your controller. Then use a circuit tester such as # 3808 to test the end of the blue wire coming out of the controller. It should only have power when you apply the manual override;...
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  • 4-Way Prong Wiring Needed That is 8' Long
  • If you are looking for just an extension then the Hopkins 4-Pole Flat Wiring Extension # HM48235 that you referenced is 10' long and will be exactly what you are needing. For a flat towing application we have the common 4-Way round connectors like part # HM47046 which is 8' long or for a 4-Way flat connector you would need both the part # RM-300150-00 (6') and the part # HM47004 (2'). Let me know if you are looking for something different and I can make a recommendation for you.
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  • How to Tow a Trailer with 7-Way Connector on a Vehicle with 6-Way Trailer Connector
  • You are correct, the only difference between a 7-way trailer connector and 6-way trailer connector is that the 7-way trailer connector will have a circuit for the reverse lights whereas the 6-way trailer connector will not. Therefore, yes the trailer brakes will still work along with all of the other lighting functions except for the reverse lights. If the 6-way is on the vehicle and the 7-way is on the trailer then the adapter you have should look something like part # 47435.
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  • 7-Way Blade Style Extension for 1991 Jayco Trailer
  • I do have a 7-Way extension that you can use but # HM47085 will not work. You will need # C56080. It may be more length than you need at 7 feet long but it is a true 7-Way extension. The extra length could be held together with wire ties or you could cut it to the length needed and reattach the wires to the connector.
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  • How to Choose a 5th Wheel Hitch for a 2015 Ram 1500
  • The best 5th wheel hitch for your 2015 Ram 1500 will depend on what size bed you have in addition to whether or not you have the EcoDiesel engine. If you have the 5-1/2' bed then you will need to use a fixed 5th wheel hitch and a Sidewinder pin box. If you have a 6-1/2' bed then you will need to use a sliding 5th wheel hitch. Finally, if you have a 8' bed then you will want to use a fixed 5th wheel hitch. I have attached the different options for you. You will need to first select the...
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  • 7-Way to 5-Way Flat Adapter for a 2010 Chevy Avalanche Z71
  • If your 2010 Chevy Avalanche has a 7-Way trailer connector then you can use adapter # TR20141. But this adapter has built-in load resistors designed to combat the bulb out sensor problem that some vehicles have when towing trailers with LED lights. For a regular 7- to 5-Way adapter use # A75TB.
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  • Trailer Junction Box Installation on Trailer to Avoid Use of Wiring Adapters
  • Sometimes trailer wiring adapters do cause odd behavior from vehicle lights, trailer lights or both. It is often better to do an actual re-wiring of the trailer to match the vehicle's connector so that adapter complications are avoided. Fewer connections are also generally more reliable. A 7-way junction box like # 277-000141 mounts to your trailer frame and includes a 7-way cord and plug. Simply cut off the existing trailer 4-pole connector and apply ring terminals like # 44-5310A to...
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  • Troubleshooting Left Trailer Wiring Turn Signal of 2010 Ford Explorer Not Functioning
  • First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are clean...
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  • 2018 Mazda CX-9 Wiring Harness 5-Way Traiiler Wiring Harness Recommendation
  • We offer a way to install a 5-way on your 2018 Mazda CX-9 but we do not sell a kit custom fit for your 2018 Mazda CX-9. For that you'll need to start with a 4-way like the part # 119147KIT which is a confirmed fit for your vehicle and will give you the 4-way base for the trailer wiring. Then to convert it to a 5-way you'd need the part # 20036 which will convert the 4-way to a 5-way and comes with everything needed.
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  • Where Does Red Wire of 4-Way # 62990 Wire To on Trailer
  • While we do not carry the 4-way kit part number 62990 I can tell you how it wires up. Basically the harness is a wishbone 4-way which has two wires for the running light circuit. One for each side of the trailer. The red wire goes to one side of the trailer's running lights and the brown goes to the other. Doesn't matter which side you pick. We have a similar wishboned 4-way wiring harness as part # A35W42B.
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  • 4-Way Trailer Wiring Harness Recommendation for 2013 Infinitiy JX35
  • I am not sure where you saw that the Curt 4-way harness part # C56584 is a confirmed fit for your 2013 Infiniti JX35 but I checked our fitguide and Curt's and they do not state that this is a fit. The only 4-Way trailer wiring options we offer for your 2013 Infiniti JX35 are hardwired install kits like the Tekonsha kit part # 119190KIT which we had the chance to install on a 2013 JX35 just like yours. Check out the install video down below to see a walk-through of the install.
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  • Converting 7-Way Blade To 4-Way Flat On Trailer
  • Yes, it is possible to convert your 7-way on your trailer to a 4-way. To replace the wiring on your Coleman 10 Foot pop up camper we offer wiring adapters that allow connection of different formats of trailer wiring. The best option to change the wiring on your trailer to match the 4-Flat on your Xterra is to cut off the 7-Way blade, and then install (them in) a trailer side 4-Way # A35W42B. The right turn function is the GREEN wire, the left turn function is the YELLOW wire, The trailer's...
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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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  • Troubleshooting Trailer Lights not Working With 2010 Toyota RAV4
  • With over 13 volts there is likely a short somewhere, but in order to determine the specific problem you'll first need to use a circuit tester such as # 3808 to test the connector on your RAV4 after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out...
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  • Troubleshooting Trailer Brakes Sticking
  • Your truck is not causing your trailer brakes to stick; if the brakes are sticking when you have your trailer hooked up to a truck but not another vehicle then it is possible your truck's brake controller or connector is the issue and you will need to troubleshoot it. To test the brake controller, sever the blue wire a couple inches from the back of your controller. Then use a circuit tester such as # 3808 to test the end of the blue wire coming out of the controller. It should only...
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  • Troubleshooting Dim Turn Signals on Trailer with Running Lights On
  • I am not sure what vehicle you have, or the particular wiring harness you have installed, but most likely a heavy duty flasher is not necessary for the turn signals to properly illuminate on the trailer. What you are describing sounds like a possible weak or bad ground somewhere on the vehicle or trailer wiring. A weak ground will often allow some lighting functions to work, but when an additional lighting function is activated (such as turn signals with the running lights already on, in...
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  • Troubleshooting Wiring With 7-Way
  • It is likely the result of a bad ground, but in order to determine the specific problem you'll need to use a circuit tester such as # 3808 to test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out of the harness,...
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  • Troubleshooting Lights not Working When Camper is Connected
  • It is likely the result of a bad ground, but in order to determine the specific problem you'll need to use a circuit tester such as # 3808 to test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out of the harness,...
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  • 7-Way Replacement for 2013 Toyota Tacoma TRD Off-Road
  • The U.S. Car type connector that plugs in to the rear of the Hopkins Endurance Multi-Tow Connector # HM40920 does use a locking tab to keep it connected until you choose to remove it. You can see this in the video I linked for you a the 1:40 mark which shows one of our technicians performing the replacement. Some factory connectors on certain Toyota trucks cannot be easily removed. If you prefer you might use an item like # HM40975-11998 which can be hard-wired.
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  • Length of Hopkins 7 Pole to 4 Pole Adapter 47345
  • I went out to the warehouse to measure the 7 Pole to 4 Pole Adapter # 47345 and found it was a total of 3-5/8" long as you can see in the accompanying photo.
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  • Methods to Clean Contacts in 7-Way Trailer Socket on 2010 Dodge Ram 2500 Pickup
  • Inside your Ram's factory 7-way trailer socket are multiple lighting circuits and a 12V power circuit that is there to power an electric trailer tongue jack or to deliver a trickle charge to a battery mounted on the trailer. If you refer to the linked photo you can see which function/circuit is assigned to each of the electrical contacts inside the connector. The 12V power circuit is carried on the pin at the 1:00 position as you look at the socket. If your wire brush were to contact...
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  • Continuous Voltage on Trailer Brake Output Circuit
  • The problem you described sounds like a short between the 12 volt power wire on the 7-way (usually black) and the brake controller output wire that runs for the 7-way to the brake controller (usually blue). In order to solve this issue you are going to need to trace each wire back to its origin while checking for breaks or frays in the wire(s). You can use a circuit tester like part # 3808 to give you a better idea where the short occurs. If you cannot locate the short then you may want...
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  • Brake Controller Not Sending a Full 12 Volts with Brake Pedal
  • My first question would be which brake controller do you have installed? If it is a proportional brake controller then this is not uncommon as a proportional brake controller senses inertia from the tow vehicle and then as the name states, applies that proportion of braking power to the brakes on the trailer. Since you are sitting still while testing, the full braking power will not be sent to the trailer with only the brake pedal depressed. However, in order to make sure there are no...
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  • Troubleshooting No 12V Power Going to Trailer Break Away Battery
  • If the break away battery on your trailer is not charging and you aren't getting any 12V power on the wire leading to it, then I recommend starting by testing the 7-Way connector on your Sierra. You can use a circuit tester like # 3808 to ensure you are getting power at the connector on the 12V pin (1 o'clock position). If you are getting power there, then there is an issue somewhere on the trailer side. You will want to inspect the trailer side connector for any debris or corrosion...
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  • Wiring Motorcycle Trailer With Separate Turn Signals
  • Got it. Here is my recommendation. If your trailer has brakes, start with the Optronics 25 ft. Wishbone 5-Way Trailer Harness with 30" Ground and 5 ft. Blue Wire # A25W5B. If it does not have brakes, start with the 4-way # A35W42B. Both of these have far more wire than needed but will work and give you plenty of extra. Then I recommend using the Vehicle to Vehicle Tail Light Converter # C56196. You will use the two brown wires to connect to your tail light running light wire....
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  • Installing Junction Box to Allow Use of Additional Reverse Lights on Trailer
  • Yes, if you replace the 4-pole connector on your trailer wiring using Pollak Black Plastic 7-Pole Trailer Plug # PK12706 you will be able to access the reverse light signals that are present on the 7-way socket on your truck. You will need to add a new length of wire to connect between the new 7-way plug and the new lights. An easier way to go is to use a junction box like # 277-000141. You can mount this on the trailer, connect the existing trailer wiring inside it using ring terminals...
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  • 4-Way to 7-Way Adapter Recommendation for Towing Trailer Without Brakes
  • If you used the adapter part # 37185 you'd be able to adapt your vehicle 4-way to a 7-way and you'd have the ability to control the trailer's lighting functions. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller...
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  • Where to Find Brake Controller Stoplight Circuit Wire on 2017 Dodge Grand Caravan
  • When we had the chance to install a brake controlelr in a similar 2014 Dodge Grand Caravan we found that the correct brake signal wire was white with a green tracer. I'd recommend looking for that wire first and then using a circuit tester like part # 3808 to verify that it has 12 volts only when the brakes are applid and use it for the red wire of your brake controller. I attached an install video for the Grand Caravan down below that shows the entire process as well.
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  • Troubleshooting Trailer Wiring that Shows Running Light Circuit Active All the Time
  • There's either a short between a 12 volt power source and the running light circuit of your trailer wiring or the converter box of your trailer wiring is damaged and it's keeping that circuit hot all the time. What you will want to do is test the wires going into the box of the converter box for voltage with a circuit tester like the # 3808 to see if there is voltage going into the box when the taillight functions of your vehicle are applied, and then test the output side of the box...
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  • Troubleshooting Trailer Lighting on Side of Trailer That Doesn't Light Up
  • Check the grounds of the taillights on the side of the trailer that aren't working. What you described sounds like a weak ground which is preventing the lights from functioning like they should. If the assemblies ground through their mounting hardware you'd need to make sure the lights are mounted to a clean metal surface or if they use a wire make sure the wire attaches to a clean metal surface. You can also jump this wire back to the ground harness of the trailer and you'd be set too.
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  • Adapter for Allowing Taillight Circuits of Semi Truck to Tow RV Style Taillight Circuit
  • The problem is that tractor trailer taillights have separate brake lights from turn signals and RV trailer wiring typically has combined. You'd have to wire in a signal converter like the # RM-732 on the adapter so that you can combine the stoplight into the RV style trailer wiring.
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  • Parts Needed to Convert 4-Way Trailer Wiring of Mazda CX-5 to 7-Way
  • For a 4-way to 7-way adapter for an application where you would never plan to operate trailer brakes all you need is the part # 37185 which allows just the trailer taillight functions to pass through. If you instead do plan to operate trailer brakes you'll need the adapter part # ETBC7 instead. This actually comes with the # 37185 plus all additional wiring to install a brake controller as well. For a brake controller I would recommend the Prodigy P3 Brake Controller part # 90195....
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  • Troubleshooting New Trailer Wiring that Shorts Out Running Light Circuit Fuse
  • It would be almost impossible to install a 7-way connector upside down as there is a notch on the top of the connector that would prevent it from fitting if installed in a different orientation. I attached a picture that points out where that is. This is also true on the more common 6-way connectors that are found on horse trailers. So you either have a short on the running light circuit of your trailer or you are overdrawing the circuit. Since you installed new lights I would be inclinded...
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  • Best Material for Wiring Connections and Contacts on Hopkins Endurance Multi-Tow Connector HM48470
  • For the actual electrical connections from the wiring to the terminals on the Hopkins Endurance Multi-Tow connector # HM48470 copper is going to be your best option. But between brass and steel I would go with steel. You don't see a lot of brass in electrical connectors like these.
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  • Installing Curt Universal Wiring Harness on 2003 Chevrolet Corvette
  • When installing the Curt Universal Harness w Powered Tail Light Converter # C59236 on your 2003 Chevy Corvette, you will actually want to follow the "Two-Wire" instructions in the installation manual. This is because your vehicle has a combined wiring system where the brake and turn signals are sent along the same wire. I have attached the complete installation instructions that you can take a look at as well.
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  • Recommended Wiring Connection Adapter for Jeep 4-Pin to Trailer 7-Pin
  • If all you want to do is go from the 4-way trailer connector to the 7-way without adding functions, all you need to do is use an adapter like # 30717. You will simply plug in the 4-way and then connect the white ground wire with ring terminal to your vehicle frame. The ground needs a bare metal to metal connection free of debris and corrosion. The other three wires on the adapter can be left disconnected. The only thing to double check since you have a boat trailer is that you don't...
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  • Parts Needed to Add a Brake Controller to a 2008 Ford F-150
  • I do have a solution for you although we do not have an equivalent to the Ford OEM part number that you referenced. Using either the Hopkins # 37185 or the Universal Wiring Kit # ETBC7 are going to be your best options. The Ford OEM harness is claimed to be "water and salt air proof" but we have heat shrink butt connectors # DW05744-5 and # DW05745-5 which give you a much better seal than any connector once they are properly installed. Once you have installed either connector you...
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  • How to Install Prodigy RF Brake Controller in 2016 Jeep Renegade Trailhawk w/4-Way
  • You can use a 4-way to 7-way adapter like the part # 37185 to install a Prodigy RF part # 90250 but you have to connect the black wire of the # 37185 up to the positive post of the vehicle battery through a circuit breaker like part # 9510. Once you do that the RF will be active and ready to go. No other wires would be needed to be ran.
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  • Can 50 Amp Surge Protector be Used with 30 Amp Power Source
  • A 50 amp surge protector like Camco RV Analyzer 50 amp # CAM55306 won't do anything unless you exceed the 50 amp rating of the product. If you need surge protection for 30 amp it won't stop a surge relative to a 30 amp setup. It basically would let anything through till it exceeds 50 amps.
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  • How to Wire Two 6 Volt Trailer Batteries Together so that the Output is 12 Volts
  • If the batteries are wired in series, the positive terminal of one battery will be connected to the negative terminal of the other. This would double the output of the batteries, assuming each battery is a 6 volt, wiring the batteries in series would provide 12 volts of output. I attached a picture that shows the way two batteries are typically wired together.
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  • Help Determining Trailer Wiring Circuits Based On Colors
  • Typically the wire colors you mentioned indicate yellow for reverse light, green for running light, blue for brake controller output, brown for right turn/stop, black for 12 volt accessory circuit, and red for left turn stop if this is a 7-way wired for an RV. Only wire color you didn't mention though is white which is usually for ground. I attached a 7-way diagram for more info as well. Other option is to use a jumper wire from a 12 volt battery's positive post to apply voltage to each...
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  • Why Would Trailer Lighting Work on One Vehicle But Not Another
  • Sounds like your trailer draws more amperage than your tow vehicle is able to supply the trailer with based on you stating that the trailer lit up "like Hong Kong," and the fact the lighting worked until you applied a circuit that draws a bit more amperage. Typically for this situation the best solution is to replace as many of the trailer's lights with LED style lights since they draw considerably less amperage. I attached a link to a page that has all of the LED trailer lights we...
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  • Troubleshooting Trailer Wiring Harness Where Both Blinkers Flash with Either Blinker On
  • First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If you see voltage on both blinker pins when either blinker is applied then the problem is the harness. If not then the problem is a short on the trailer's wiring between the two stop/turn circuits. Most likely exposed wire or corrosion between the wires is...
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  • Trailer 7-Way Wiring When Colors Don't Match
  • I'm happy to assist. The 7-way plug on your trailer will have the correct pin locations even if the colors don't match. It is not uncommon for different color wires to be used. I've attached a photo with the wiring location and function so you can match those versus the function. I've also attached a video and article to assist. You can also use the circuit tester # 3808 to test power functions.
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  • Electric Trailer Brakes Permanently Engaged After Replacing 7 Pin
  • It is not recommended to bypass the break-away battery and a very small current is normal. The 7-pin connector sounds like it is not connected correctly. It is not uncommon for the trailer brake controller pin at the 5 o'clock position to be reversed with the 12V power on the 1 o'clock position. That reversal will cause the trailer brakes to constantly be engaged. This can be a reversal on the vehicle side or the trailer side. I'd check that first using a circuit tester like # 3808....
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  • Troubleshooting Curt Brake Controller that is in Standby Mode and has 12 Volts on 7-Way
  • There's a chance the problem is the wiring of the controller and 7-way or it's the brake controller itself. Testing the brake controller is fairly easy. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like the Quickee Tester, part # 3808, you should get output to the controller side of the wire you severed. If the manual slide activates the trailer brake output wire properly, try the...
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  • Kit to Upgrade 5-Way on Trailer to 7-Way
  • We have a kit that's designed for exactly what you are looking to do. The Trailer Wiring 7-Way Upgrade Kit part # ET7WK is designed for upgrading a trailer from a 4-way to a 7-way but can also be used with 5-way wiring as well very easily. I attached an install video for this kit for you to check out as well.
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  • 6-Way Square to 4-Way Flat Adapter Recommendation
  • We have just what you are looking for. The adapter part # 30104 goes from the 6-way square that you have to a 4-way.
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  • Adapter Recommendation to go From 4-Way Round to 7-Way Blade
  • If you need an adapter to go from a 4-way round female socket to a 7-way blade socket the Hopkins Endurance Flex-Coil Trailer Connector Adapter w/ Nite-Glow # HM47043 is the correct coiled adapter for that. There isn't a specific adapter to go from a 4-way round to a 7-way round since the 4-way round isn't that common.
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  • Troubleshooting No Running Lights on 2013 Toyota 4Runner
  • First thing you should check is under the hood of your vehicle for a blown fuse or relay for the running light circuit. Next, test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to...
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  • Parts Needed to Bypass TIPM in 2006 Dodge Ram 1500 for Trailer Wiring
  • The trailer wiring circuits on the newer Dodge trucks have some interesting issues. The issue is the TIPM like you mentioned. If it detects enough shorts it will eventually lock up and require you to spend quite a bit of money. It basically is a big circuit board. The easiest way to deal with them is to bypass the factory trailer wiring. To do this with a 7-way like you said you have on your truck you will first need to start with a 4-way. For that you'd want to use the install harness...
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  • How to Install the Hopkins Endurance Multi-Tow 4-Way Flat to 7-Way RV Trailer Adapter # HM47180
  • If you are just needing to make the 4-Way on your 2004 Jeep Liberty compatible with the 7-Way on your trailer (without brakes) then the Hopkins Endurance Multi-Tow 4-Way Flat to 7-Way RV Trailer Adapter # HM47180 is exactly what you need. To install this just simply connect it to your existing 4-Way and then ground the white wire. This gives you the basic lighting functions for your trailer. Should you want to utilize a brake controller or the 12V Power on the 7-Way in the future then...
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  • Adapter for 7-Pin Harness on Vehicle to 4-Flat Harness on Trailer
  • There are no diagrams available for this as you would need to find the functions of the wires with a circuit tester. However, there is a much easier way to connect your trailer's 4 flat to your vehicle's 7 way with the use of a simple adapter. So long as your connectors look like the ones in the accompanying photo you can use the Pollak 7 Pole to 4 Way Connector Adapter # PK12716, which plugs into your 7 blade and then you plug in your 4 flat. I've added a link to a video review of...
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  • Troubleshooting No Running Lights on Trailer
  • There are a number of possible reasons as to why the running lights are not working on your trailer. I recommend first using a circuit tester like # 3808 to test the vehicle side connector while you have a buddy sit in the cab and run through the lighting functions. If you find that you do have power at the running lights circuit with the running lights on, then you at least know the issue is somewhere on the trailer side. If you do not receive power at this pin, then the problem is...
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  • 7-Way Extension To Avoid Connection Ripping Out Of Socket
  • The Curt Universal 7-Way Extension # C56080 will give you an additional 7 feet of extension to ensure your connection will not rip out of the socket. Extension plugs into your existing 7-way, RV-style connector to route functionality from the rear of your vehicle to your trailer.
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  • Trailer Lights Work On Another Truck But Not On My Truck
  • If the trailer seems to work fine on another truck, it sounds like the issue might be in the tow package wiring on your truck. First, make sure that the 7-Way is wired how you want it. Simply use a circuit tester # 3808 and test the functions of the various pins. I have a diagram showing the terminals inside the 7-way and what function each one of the terminals serve. For example, if a prong is used for the turn signal function, you would have a friend engage the turn signal in the cab...
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  • Ram 2500 Vehicle Side Wire Failure
  • You have isolated the issue to the truck and already checked the fuses and the trailer connector. If you haven't use your owners manual to check all the fuses and relays for towing just to be sure. Next, I would check that the ground connection is good and clean as well. It needs to be grounded to bare metal. If this checks out, the problem is on the wiring itself. If you follow the wires from the backside of the 7-way, there is another connector that the trailer harness plugs into....
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  • Troubleshooting Led Trailer Light Wiring to an Existing 7-Way Trailer Connection
  • I would need to see the actual light to assist. The wire color doesn't always fit with the function, however white does normally dictate ground connection on most lights and it will not work properly without a ground connection. My recommendation would be to connect a 12V battery to each wire and grounded to your trailer frame to confirm function. To test functions though your trailer wiring connection to your vehicle, you can use a circuit tester like # 3808. The LED lights will...
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  • Troubleshooting Trailer Wiring with 4 Pins but 5 Wires With Trailer Lights Not Working
  • Thanks for the photo. The harness on your trailer is known as a wishbone harness and simply has the running lights split from side to side so you don't have a jump wire from one side of the trailer to the other. This allows a clean wiring from your trailer tongue to each tail light. Because you are able to get power from the vehicle but the trailer lights don't work, there is some simple troubleshooting you can do. First, I recommend cleaning the terminals on your trailer connector...
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  • Parts Needed to Install 7-Way on 1992 Chevy C/K Series Truck
  • You will need to start with a 4-way (if you do not have one). For that you would want the # 18252. Now if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For a brake controller I would recommend the Prodigy P2 Brake...
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  • Parts Needed to Install Prodigy RF Brake Controller on Vehicle with 4-Way Trailer Wiring Adapter
  • Since it sounds like you have the Prodigy RF brake controller part # 90250 and a vehicle with just a 4-way all you'd need to install the controller and convert to a 7-way is the part # 37185. With this all you need is to run a length of 10 gauge wire like part # 10-1-1 through a breaker like part # 9510 to the positive post of your vehicle vehicle battery and you'd be set.
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  • Troubleshooting Trailer Turn Signals Not Functioning After Using 7-Way Adapter
  • The trailer lights being LED should not be a problem. Especially since the running light circuit works. Can you verify that the stop/turn circuits are functioning properly on the vehicle's wiring with a circuit tester like part # 3808? First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage...
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  • Trailer Wiring Recommendation for 2014 Ford F-150 without Factory Wiring
  • If your 2014 Ford F-150 does not have any trailer wiring at all the only options for adding a 4-way would be a hardwire kit like the part # 18252 which would splice in by using the included quick splices to connect to the correct circuits.
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  • Finding Ground Circuit of 7-Way Wiring With Unknown Wire Colors
  • None of those wire colors are standard ground wire colors. Typically it's a white wire. The rest of your wires look standard for the most part but since you don't have a white wire you may have to do some testing. You can try using a jumper wire from a 12 volt power source like a battery to apply voltage on each of the circuits to see what taillight functions apply. The ground will spark when you touch the wires together.
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  • Troubleshooting Trailer Connector on 2017 Chevy Silverado
  • It is likely the result of a bad ground, but in order to determine the specific problem you'll need to use a circuit tester such as # 3808 to test the connector on your Silverado after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out of the harness,...
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  • Troubleshooting Trailer Light Wiring Which is Likely a Bad Ground Connection
  • It is likely the result of a bad ground, but in order to determine the specific problem you'll need to use a circuit tester such as # 3808 to test the connector on your tpw vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out of the harness,...
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  • Troubleshooting Lights After Installing 4-Way on 2014 Ford Fusion
  • It is likely the result of a bad ground, but in order to determine the specific problem you'll need to use a circuit tester such as # 3808 to test the connector on your Fusion after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out of the harness,...
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  • Troubleshooting Lights on Trailer That Do Not Work
  • It's probably a ground issue, but in order to determine the specific problem you'll need to use a circuit tester such as # 3808 to test the connector on your Silverado after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out of the harness, and if...
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  • Troublehsooting Trailer Lights Not Working With 2012 Nissan Frontier
  • I imagine it's a ground issue, but there are a few troubleshooting steps to check. You'll need to use a circuit tester such as # 3808 to test the 7-way on your Frontier after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out of the harness, and if...
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  • Troubleshooting Turn Signal Lights on Trailer That Won't Work
  • It is likely a bad ground, but in order to determine the specific problem you'll need to use a circuit tester such as # 3808 to test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out of the harness, and if they...
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  • Troubleshooting No Trailer Battery Power or Reverse Light Function on 7-Way of 2000 Ford F-250
  • There is a fuse for the trailer tow battery in the engine compartment on the driver's side. There is also a backup lamp relay and a trailer bow battery charge relay in that same engine compartment power distribution box. Use your owners manual to show you these fuse and relay locations. Then use a circuit tester like # 3808 to check each pin of your 7-way for function. If you don't have the fuses or relays, you can use the Ford Replacement OEM Tow Package Wiring Harness, 7-Way (Super...
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  • What is Purple Wire on Adapter 4-Pole to 7-Pole and 4-Pole Used For?
  • If you are asking about the Hopkins Adapter 4-Pole to 7-Pole and 4-Pole # 37185, the purple wire is an auxiliary wire for 12V power, reverse lights or reverse lockout. You can use a circuit tester such as # 3808 if you are unsure which wire you need to connect to the purple wire for the aforementioned functions.
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  • Troubleshooting Trailer Wiring that Locks Trailer Brakes When Brake Pedal is Pressed
  • Sounds like you have a short between the stop/turn signal on your trailer wiring and the brake output which is applying the brakes every time you touch them. Go over the wiring of both the connectors on your truck and trailer to see if you can find where the short is and fix as necessary. To narrow down which side has the short on it apply both blinkers and the one that pulses the brakes with the flasher is the one with the short.
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  • Location of 12 Volt Power Wire on 7-Way and the 3rd Brake Light Circuit of a 2005 GMC Sierra
  • The third brake light wire is not actually part of the trailer wiring but it should be near it. Look behind your factory 7-way for a light blue wire. It's often in the same wire loom as the 7-way's wiring so you may need to peel back some of the plastic loom. Use a circuit tester like part # 3808 to test for function because the color could be different. The 12 volt circuit is on the trailer connector. It's the wire going into the pin at the 1:00 position on the outside of your 7-way...
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  • 7 Way Trailer Connector Vehicle Tester Always Shows 12V Power
  • If you have something similar to the 7 Way Trailer Connector Vehicle Tester # TR20117 and it is always showing 12V power there is no wiring issue because that power source is from your vehicle battery.
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  • Installation of Pollak 7-Way Plug with 6 Colored Wires
  • The Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector - Trailer End # PK12706 will match the colors and locations of the attached photo. I've also attached a wiring article to assist further if the colors don't match functions correctly so you can be sure to match the functions.
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  • Comparing the ModuLite Harness Part # 119192 and the Upgraded Modulite Harness Part # 119147KIT
  • The main difference between the ModuLite Ultra Protector Wiring Harness w/ Integrated Circuit and Overload Protection part # 119192 and the Upgraded Modulite Vehicle Wiring Harness Kit with 4 Pole Trailer Connector part # 119147KIT is that the harness ending in "47" has an included circuit tester whereas the harness ended in "92" does not. Other than the package contents, the harnesses are virtually identical. Either harness would work for what you are trying to do. If you already have...
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  • Troubleshooting Brake Controller Showing "No Connection" After Install
  • Typically the solution to your problem is to clean the pins of the trailer 7-way as corrosion or dirt can prevent the connection from being made like it needs to be. We see this quite a bit actually. Especially on trucks with a few years on them like your 2005 Ram 1500. The wire color change does not surprise me as the circuit goes through a couple harnesses before ending up at the rear connector.
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  • Troubleshooting Trailer Wiring Not Functional on Dodge Ram
  • Sounds like you have some blown trailer wiring fuses and/or relays under the hood of your truck. You'll need to go over all of the trailer wiring related fuses and replace as necessary. Some of the Mopar trucks will use a TIPM for powering the trailer wiring. If your vehicle has a TIPM the only way you'll get your trailer wiring back is to take it to a dealer and have them reset it. You should note it can only be reset a few times before needing replaced.
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  • Will Pollak 7-Way to 12 Volt Power Outlet Adapter # PK11896 Work with Blue Sea 1010 Plug
  • Your Blue Seas plug 1010 will work with the Pollak 7-Way to 12 Volt Power Outlet Adapter # PK11896. I did not see anything on that Blue Seas plug stating that a special outlet would be needed and the twist to lock feature seems to be exclusive to the plug end. The Pollak outlet locks into a 7-Way the same way that any 7-Way connector does; using the lid of the 7-Way to prevent the outlet from coming out. Rough terrain would also not be a problem assuming of course you are cautious while...
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  • Trailer Coupler and Hitch Ball Sparking and Fuse Blowing
  • You have a pretty serious issue with your ground wiring, which is why the metal on metal contact is creating the sparks. You'll need to check the grounds of all your lights, ensuring that they are securely attached to bare metal surfaces free of any paint, dirt or corrosion of any kind. Keep in mind that each tail light assembly at the back of your trailer also needs to be grounded; I've added links to help articles for you on trailer wiring and troubleshooting wiring you may find useful.
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  • Recommended Trailer Adapter for 7-Way on 2014 Hyundai Santa Fe
  • For your 2014 Hyundai Santa Fe, you will need to check the local and state laws to determine if you can legally tow a trailer with brakes without having the working components. These laws vary from state to state and sometimes are based on trailer weight. If you are able to use the 7-way without connecting all the parts, then you can simply use the 4 to 7-way adapter # 30717 and brackets # PK12711U and # 18140. If you do need a brake controller, then I recommend the Prodigy P3...
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  • Troubleshooting Trailer Brakes That Are Not Working
  • Since you have already tried extensively cleaning your trailer connector with sandpaper and electronics cleaner to no avail, it sounds like it may just be damaged and need replacing. You can cut off your trailer connector and replace it with the Hopkins 7-Way RV Style Connector # H20046; I also strongly recommend using Dielectric Grease # 11755 which is going to prevent corrosion and seal your connection. Additionally, make sure to inspect the power wires to the magnets and look for...
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  • Troubleshooting Left Turn Signal on Trailer that Overrides Brake Lights on Right Side of Trailer
  • It sounds like you are using a universal wiring kit like the Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector # C59236 on your 2015 Dodge Grand Caravan. This is a kit that you hardwire to your vehicle and it has a green wire for the right stop/turn signal, a yellow wire for the left stop/turn signal, a red wire for the stop light, a white wire for the ground, and a brown wire for the tail/running lights. If your vehicle has the stop signal combined with the turn signals...
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  • Troubleshooting Trailer Wiring that Doesn't Work Consistently When Running Lights are On
  • Try improving the connection of the main ground wire of the trailer wiring harness. Make sure it is attached to a clean metal surface. Or you can run all of the trailer wires back to the main ground. This is actually the ideal solution. But you can also check the current grounds for the lights to make sure they are making a solid connection to a clean metal surface. What you described is the classic insufficient ground scenario so finding a way to improve the grounds will fix the problem....
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  • Troubleshooting Brake Controller Install Where Brakes Don't Release When Trailer Is Connected
  • When the brakes of a trailer don't want to release whenever a trailer connector is attached the issue is that the brake output circuit and the 12 volt wiring circuit of the trailer are shorted together. Most likely the circuits are either shorting together due to exposed wire or somehow the two circuits got wired backwards. I attached a diagram that shows how a 7-way should be wired for you to check out as well.
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