Shop by Vehicle
view cartView Cart

CALL NOW - 800-298-8924

Product Experts Available Now!


Filter Questions and Answers:


reset filter

Expert Answers about Wiring


  • Taillight Converter Recommendation for a Trailer with Separate Taillights with 4-way Connector
  • I have a solution for you, but the 7-way side of your trailer wiring wouldn't easily be adapted to fit your wiring needs. A better solution would be to install the converter # C56196 on the wiring of the trailer you plan on towing with your 2007 Fleetwood Bounder 34F motorhome. This way your trailer can easily be towed by any vehicle with a 4-way. I attached a diagram that shows how this converter installs onto a trailer's taillight circuit.
    view full answer...

  • How Does the Tow Ready 4 Pole to 5 Pole # 20036 Install on a 2011 Jeep Grand Cherokee
  • The install for the Tow Ready 4 Pole to 5 Pole # 20036 really is pretty simple. All you will need is a circuit tester like the part # 3808 to test the wires going into the reverse light harness. The color of the wire would most likely not be red/black though. I attached an install video for this harness for you to check out as well.
    view full answer...

  • How to Install a Wishbone Wired 4-Way to a Trailers Wiring
  • To wire the 4-way connector you have to your trailer you will need to ground the white wire, run either brown wire to the left or right side running light circuits, run the yellow wire to the left stop/turn circuit, and the green/brown wire to the right stop turn circuit. It could be that your trailer's wiring needs to be cleaned up a bit. You will want to check and make sure all of the wire colors I mentioned only activate the circuits I said they correspond to. If not, then there might...
    view full answer...

  • Towing Trailer with 7-way RV Connector Using Semi Tractor with 7-way Round Pin Connector
  • I found the article you referenced and attached the text of it below. I also attached the installation instructions and diagram to this message as well. To tow a trailer that uses a RV style 7-way blade-style trailer connector with semi that has a 7-pin connector, you will need to construct an adapter that also combines the brake signal into the right and left directional signal pins. This can be done by using a female 7-pin socket # PK11720 to accept the plug from the semi, a...
    view full answer...

  • Adapter Recommendation to go From 50 Amp Male to 125 Volts Female
  • Without knowing what amp female side connector you need we have a few options you would need to check out. If you need a 50 amp male to 30 amp female you would want the # CAM55175. If both connectors are 50 amp rated then you would want the # CAM55562. This goes from marine-style, 50-amp power plug to a 50-amp standard power source.
    view full answer...

  • How to Make a 5-Way Female to Vehicle Side 4-Way Trailer Wiring Adapter
  • It sounds like you have a 5-way male connector on your RV like the part # PK11501 and are looking for a way to adapt it to your trailer's 4-way. You will need to make an adapter for this as one isn't available. You will need the part # PK11502, # 16-4B-1 which is sold by the foot and then a 4-way part # 18172. You will need to test the wires of the 5-way on your RV with a circuit tester like part # 3808 for function and then wire up the 4-way flat as needed. The wire colors of the...
    view full answer...

  • Troubleshooting Honda Ridgeline Blinkers that Stop Working when Brakes are Applied
  • Typically when this issue arises on a Honda Ridgeline the issue is that the "small lights" fuse under the hood is blown. This may or may not have been related to the trailer wiring you installed.
    view full answer...

  • Instructions to Wire Dump Trailer with Electric Brakes
  • I would use the RV-Style Trailer Connector, # PK12706, which you reference, and install the wires in the proper locations in the 7-Way connector. Our wiring page, see link, has photos that detail the wiring configuration of the 7-Way RV trailer connector for you to check out. You will need to test the functions of each wire using a 12 volt battery to determine their function. Once you know the function, you can use our trailer connector wiring diagram to make the proper connections.
    view full answer...

  • Troubleshooting a Trailer that Taillights, Blinkers Both Flash and Only One Running Light
  • It sounds like the problem is the wiring of your truck like it sounds you have determined already. What I would do is use a circuit tester like part # 3808 to test the circuits of your 7-way while a buddy applies the different taillight functions. Use the diagram I attached to the right for more info. The problem could be as simple as corrosion on the connector that needs to be cleaned off (inside or outside of the connector), or it could be that the wires of the connector have shorted...
    view full answer...

  • Installation Instructions and Wire Functions of Tow Ready Trailer Wiring Harness 119147KIT
  • I have included a link to the right to the instructions for wiring harness # 119147KIT. In the mean time the red wire is for brake lights, green is right turn signal, yellow is left turn signal, white is ground, brown is running lights, and black is the power wire. We do not re-sell returned items. We have to kit the harnesses together with the extra wire and fuse holder though so you get everything in one package.
    view full answer...

  • Adding a 4-Way Trailer Wiring Harness to a 2007 Chevy Monte Carlo LT
  • To add a trailer connector to the back of your 2007 Chevy Monte Carlo LT you will need to hardwire in a harness using # 18252. This harness comes with a circuit tester which you will use to determine the functions of the vehicle tail light wiring to install the 4-Way. On the 4-Way, the white wire is ground and will attach to a clean bare metal surface. The yellow wire will connect to the vehicle's left turn and brake light wire. Brown will connect to the vehicle's running light/tail...
    view full answer...

  • Troubleshooting Inactive 7-way 12 Volt Accessory Circuit of 2007 GMC Sierra 1500
  • I am going to go out on limb and say that you are trying to activate the 12 volt accessory circuit on the 7-way of your 2007 GMC Sierra 1500 and it isn't working so you are looking for a fuse to replace? Actually what is happening on your truck is that there are a few underhood connections that need to be made in order for this circuit to be completely activated. For more info on this check out the FAQ article I attached to the right and scroll down to the section titled, "Finalizing...
    view full answer...

  • Parts Needed to Convert a Jeep's 4-Way to a 7-Way
  • Yes, we have exactly what you need. To convert the 4-way of your Jeep to a 7-way so that it will adapt to your trailer that has a 7-way you have two options. If your trailer doesn't have brakes all you would need is the # 37185. This would simply plug into your Jeep 4-way and would provide a 7-way for your trailer to connect to. Now if your trailer has brakes you will need a different part. Instead you will need the brake controller install kit # ETBC7. This comes with everything...
    view full answer...

  • Troubleshooting Right Stop/Turn Circuit on Aluminum Trailer
  • It sounds like you have narrowed the problem down to being somewhere on the right stop/turn circuit (green wire) on the trailer. If you can use your circuit tester to test that circuit as close to the light assembly as possible to see if the light is getting voltage or not. The other possible problem is that the ground of the assembly isn't sufficient. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds...
    view full answer...

  • Troubleshooting Trailer Brakes that Lock Up When Connected to Trailer Wiring
  • This is a fairly common problem for trailer setups that use 6-way connectors like the # PK11604 that you referenced. The issue is that there is two accepted ways the connector can be wired up. The only difference between the two setup is that the brake output circuit and the 12 volt accessory circuits are swapped. It sounds like your vehicle is wired one way and the trailer is wired the other way. What you will need to do is swap the two circuits on either the trailer or the truck....
    view full answer...

  • Horse Trailer Brakes Lock Up When Connected to 1999 Ford F-250
  • It sounds like either the trailer side connector is not pinned to match the vehicle side connector or there is a short circuit (possibly due to corrosion on the pin or inside the trailer connectors) causing the brakes on the trailer to lock up. The easiest thing to check first is for dirt/corrosion on the pins and inside each of the trailer connectors. Then you can make sure that the trailer side connector is wired up to work properly with the vehicle side connector. I have included...
    view full answer...

  • Adding a 4-Way Trailer Connector to a 2014 GMC Sierra 1500
  • If your 2014 GMC Sierra came with a factory 7-Way you can use # 41155 to plug in a 4-Way in its place. Or you can use an adapter such as # PK12716. If your truck did not come with any trailer connector you would have to contact a GMC/Chevy dealer for the proper parts since there are currently no aftermarket 4-Way harnesses confirmed to fit your truck.
    view full answer...

  • Troubleshooting Non-Functioning Running Lights on Trailer Towed By 2014 Nissan Frontier
  • It sounds as if you might have a blown fuse. You'll need to check the diagram on the lid of the fuse box under the hood, and look for a fuse for the trailer running or parking light circuit, and replace it. Before plugging the trailer into the vehicle, you'll want to closely examine the running light circuit for any shorts that would have caused the fuses to blow. Start at the trailer connector, and examine it for damage. Trace the running light circuit (usually a brown wire) back to...
    view full answer...

  • Flat Towing Wiring Options for 2014 Ford F-150 Platinum
  • Strictly speaking, both you and your friend are correct. It just depends on which type of toad wiring harness is used. The link at right will show you all flat-towing wiring kits for the 2014 Ford F-150 Platinum. These include a custom-fit option from Hopkins, part # HM56000. This kit installs without cutting and splicing by plugging in to the F-150 tail lights and includes integrated diodes to prevent feedback. This operates as a combined lighting system.
    view full answer...

  • Trailer Wiring Extension to Allow Utility Trailer Plug to Reach Truck Bed Connector
  • We can definitely help you! If your trailer and truck connectors are RV-style 7-way blade types we offer extensions in various lengths. For example, if you need several feet of additional length we offer the Curt Universal 5th Wheel/Gooseneck 7-Way Extension # C56080 which is 7-feet long. If a shorter extension will suffice you might use the 28-inch TorkLift # TLW6028, 36-inch # TLW6036 or 48-inch # TLW6048. If either your truck or trailer use different connectors (the linked...
    view full answer...

  • Tow Ready Lamp Out Adapter Recommendation for a 2012 Mercedes Towing LED Light Trailer
  • Yes, the Trailer Connector Adapter w/ Lamp-Out Sensor Bypass # 20142 that you referenced is designed to do exactly what you are needing. This connector is designed to let foreign vehicles with lamp-out warnings tow trailers with LED lights. You would want to plug this into the 7-way on your vehicle.
    view full answer...

  • Using 4 to 5-Pole Trailer Connector Adapter # 20036 for Towing Boat w/ 2011 Toyota Highlander
  • The extra pin on your boat trailer's connector is most likely a reverse lock-out for your surge or hydraulic trailer coupler. The extra circuit is tied into the reverse light circuit of your vehicle. When the vehicle transmission is shifted into reverse, the reverse light circuit energizes and activates a solenoid in your coupler, which allows you to back the trailer without the brakes applying. We do indeed have an adapter that would work for you, part # 20036. The extra blue wire on...
    view full answer...

  • Troubleshooting Trailer Left Turn Signal That's Not Working
  • Without knowing the year, make and model of the vehicle, I can't really provide any specifics but I can provide you some general things to check. The first thing you'll want to do is determine if the problem is in the vehicle or the trailer wiring. The easiest way to do this is to plug in another trailer if one's available and see if the problem persists. If this isn't possible, use a circuit tester like part # 40376 on the trailer connector on the tow vehicle. Activate the left turn...
    view full answer...

  • Installation Of Wiring Harness On 2014 Subaru Impreza
  • Many times the problem you are having is that that there is not a good ground connection. Another wire to check is the 12V power wire. It needs to be connected to the battery. Also check the in-line fuse to make sure it is in place. I have attached the installation instructions for the Tow Ready Wiring, part # 119179KIT that would be used on your 2014 Subaru Impreza that is not the WRX or WRX STi model. The instructions have a diagram included that show 6 wires being attached for the...
    view full answer...

  • Trailer Wiring Recommendation for a 2003 Mazda Tribute
  • We have several trailer wiring options that are confirmed to fit your 2003 Mazda Tribute, but the part # HM48895 that you referenced is not one of them. Instead you would want the part # 118343 if you don't have the tow package and part # C55255 if you do have it.
    view full answer...

  • Replacement 7-way for a 2015 Chevy Silverado
  • From a previous question you submitted I was able to determine that you have a 2015 Chevy Silverado. It sounds like you are looking for a replacement 7-way for your truck based on the part you referenced. If so, the correct part would be the Hopkins 7-Way part # HM40975.
    view full answer...

  • How to Maintenance Charge a Battery Installed on an Enclosed Trailer
  • You will need to run a separate battery for powering the accessories you mentioned from the breakaway battery. Something bigger than a typical breakaway battery would be required. Now to charge the battery you would only be able to run a maintenance charge on the battery through the 7-way as the gauge of wire would be to small to charge a dead battery. To do this you will need to run a 10 gauge wire from the trailer connector to the positive post of the battery. For that you can use...
    view full answer...

  • Does a Breakaway System Battery Affect Everyday Trailer Brake Performance
  • Electric trailer brakes can work on a trailer that doesn't have a breakaway system. So the answer to your question is no, the breakaway battery would not affect how normal trailer brakes will operate under normal circumstances. The only time the breakaway battery will change how the brakes are performing is when the pin of the system has been pulled and the voltage of the battery is being applied to the brake assemblies. I attached an FAQ on breakaway systems plus an FAQ on troubleshooting...
    view full answer...

  • Troubleshooting Install of Tow Ready Wiring Kit # 119179 Doesn't Work With Running Lights are On
  • The Trailer Wiring Kit part # 119179 fits several vehicles and several different configurations of vehicle wiring. Without knowing what vehicle you have or what style of taillights you have on your vehicle it would be hard for me to say for certain. Based on the description of how you installed the harness it sounds like you have it wired up like a 2 wire system. It could be possible that you have a 3 wire system and would need to wire it up like the illustration I attached.
    view full answer...

  • Troubleshooting Factory Trailer Wiring for 2003 Ford F250
  • First I recommend cleaning the connector and make sure there is no corrosion on the pins. Check the wires at the back of the plug. You may need to remove the wires from the connector as corrosion can build up in the connector. If all of the connection points are corrosion free, then begin testing the wires themselves. Since you are not receiving a signal on some of the pins I recommend tracing those wires back till you find a point where the signal is active. It may be that connection...
    view full answer...

  • Which Trailer Wiring Harness is Recommended for 2012 Nissan Frontier
  • If your 4-pole is damaged and needs replacing or the plug on the driver's side frame rail is active but you don't have the 4-pole, you'd use the # 118263. To determine if the plug is active, you'd use a circuit tester, like part # 40376. Have a helper activate each lighting function (right turn, left turn, running lamps and brakes) and see if the sockets on the plug are active. If they are, you'll just need the # 118263. If the plug isn't active, you'd use the # 118525 which includes...
    view full answer...

  • What Trailer Connectors Work with TowReady 7-Way to 5-Way and 4-Way Trailer Adapter # TR20141
  • The referenced TowReady 7-Way to 5-Way and 4-Way Trailer Adapter # TR20141 is designed to accept either a standard 5-pole or 4-pole flat trailer-side connector. The linked photo shows a standard 4-pole trailer connector. The linked article shows a whole range of trailer connectors. If your trailer's connector is different then you might consider installing a new 4-pole like part # A35W42B which will be fully compatible with the Tow Ready adapter. Please feel free to submit a photo...
    view full answer...

  • Wiring and Connector Recommendation for Rewiring a Trailer
  • I think you best option would be to get a part # HM20248. This is a 7-way connector for a trailer with an 11 foot lead of 7-way wires. I would use this to totally rewire the trailer and then for additional wire I would go with the 10 gauge wire # 10-1-1 sold by the foot for additional wire that would get run to the brake assemblies and then 12 gauge wire # 12-1-1 for the lights. For butt connectors you would want the # DW05745-10. I attached an FAQ on trailer wiring for you to check...
    view full answer...

  • 7-Way Tester Recommendation for a Land Rover with 7-Way and P3 Brake Controller
  • Yes, we do offer a 7-way tester that will allow you to plug into the 7-way at the rear of your Land Rover to test all of the functions. For that you would want the part # TR20117. Check out the review video I attached for more information.
    view full answer...

  • Trailer Wiring Installation Video for a 2005 Mercury Grand Marquis
  • I attached an install video that shows how the trailer wiring harness part # 119179KIT will install on a 2005 Mercury Grand Marquis as well as a set of installation instructions that detail how this should be installed. I don't have a document that specifies how the # 119179KIT will install on your exact vehicle since this is a universal install harness, but I can guarantee that if your installer follows the video I attached it will work just fine.
    view full answer...

  • 7-Way Wiring Diagram Availability
  • Check out the picture I attached plus the FAQ article to the right to see a 7-way diagram you could use to wire up your trailer.
    view full answer...

  • Troubleshooting 2000 GMC Sierra 1500 Wiring Functions
  • You will need to wire the Pollak 7-Pole and 4-Pole Trailer Connector Sockets, # HM40975-11998, for function rather than by color. Wiring color is not an exact science. A company may change wiring color even within the same model year. The best way to determine functions of your wires is to test them for function with a circuit tester, like Quickee # 3808. To test the wires using a circuit tester, first turn on the left blinker. Find the wire that carries a signal in unison with the blinker....
    view full answer...

  • Brake Controller Install on 2000 Ford F-150 With 4-Flat trailer Connector Using Adapter # HM47200
  • The additional wire leads on the Hopkins # HM47200 Quick-Install Trailer Connector Adapter are provided to deliver additional signals to the 7-way vehicle socket. These signals include the brake controller output signal (blue wire), the trailer 12V power feed (red wire) and the vehicle's reverse light signal (purple wire). The white wire is ground. The blue lead connects to the blue wire at the back of your brake controller; the red wire connects to your vehicle battery positive terminal...
    view full answer...

  • How to Get the 4-Way Wiring # 18252 Longer than 6 feet
  • What you would need to do is get the # 18252 that you referenced which comes with 6 feet, and then also order the part # 16-4B-1 which is bonded 4-way wiring sold by the foot. Basically you would need to order a quantity of the # 16-4B-1 in the amount of feet of extension you would need so that you would have the proper length of wire to install the 4-way on your trailer.
    view full answer...

  • Troubleshooting 4-Way Wire Harness installation On 2009 Cadillac SRX
  • The wiring harnesses and kit, part # HM48895 and part # HM46155 you referenced in your question are not designed to be a fit for your 2009 Cadillac SRX. If you find that you have the correct wire harness for your SRX you can check the wiring to make sure all of the wires have been connected as the instructions state. Also, you will want to make sure the ground wire has been secured to a clean bare metal surface. Loose or corroded grounds can cause some of the same problems you described....
    view full answer...

  • Dimensions of the Hopkins Endurance 7-Way Trailer Connector Socket # HM48480
  • The Hopkins Endurance 7-Way Trailer Connector Socket, # HM48480, measures 2-3/4 inches wide and 3 inches tall. I have attached a picture to illustrate these measurements as well as the distance between the mounting holes.
    view full answer...

  • Recommended Trailer Wiring Kit for a 2011 Chevy Malibu LTZ
  • The Tow Ready wiring kit # 119179KIT you are installing your 2011 Chevy Malibu LTZ can work with 2 or 3 wire systems. Your Malibu is a 2-wire system, as there is one bulb inside each tail light housing that illuminates for both the brake and turn signal functions. I have also included an FAQ and installation video too.
    view full answer...

  • Where on 2011 Toyota Tacoma to Access Reverse Lamp Circuit
  • I'm not sure which LED lamps you were considering, but a 4-pole or pin flat trailer connector doesn't carry a reverse light circuit. You'd need to tap directly into the wiring harness that feeds the vehicle taillights. If you access the area directly behind the taillights, you should easily be able to locate the wire feeding the reverse lamp. Tap the power feed for your LED reverse lights into that circuit. If your Tacoma has the factory 7-way connector, the center pin is connected to...
    view full answer...

  • Replacing Damaged 7-Way on Horse Trailer
  • There's more than one accepted way to wire a 7-way, but the most common uses the green wire for right turn/brake, yellow wire for left turn/brake, brown for running lamps, blue for brake output black for 12-volt accessory power to the trailer, white for ground and purple for the reverse light circuit. Because wire colors can vary so greatly, we typically tell folks to wire by function, not by color. An alternative color code is yellow wire for auxiliary or reverse lights, green for running...
    view full answer...

  • 2008 Chevrolet 2500HD 12 Volt Battery Wire for 7-Way Connector
  • Sounds like you have the correct 7 way connector and the correct pins, but you are missing the wire that runs from the power posts to the connector. First let's make sure. In the under hood accessory fuse block there are two power posts on the engine side of the block. The post closest to the front of the truck should have a wire connected to it that runs back to the factory trailer connector and provides 12 volt power at the 1:00 position as you have stated. If the wire is not already...
    view full answer...

  • 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 # 3808 and # 40376. At right I have linked a video showing how the tester # 40376 can be used to test for signals on trailer wiring. I was able to use your email address to find purchase...
    view full answer...

  • Availability of a 50 amp RV Female Connector
  • We don't have exactly what you need, but we do have a female end 50 amp connector # AR19194 that you could use to make an adapter if you could find a male marine connector to wire it to.
    view full answer...

  • Recommended Way to Test Trailer Lighting With a Car Battery to a 4-Way Trailer Connector
  • The 5-way flat trailer connector in-line circuit tester # 20115 you referenced won't be needed. You would need to have a 12V power source and your jumper wire which will let you know if you have working trailer lights. The most common gauge trailer light wire for 4-way or 5-way trailer connector is 14-16. You will need to make sure that you secure the ground wire to the trailer frame. See picture to the right. I would recommend a circuit tester such as # 3808, if you are checking...
    view full answer...

  • Mounting Hole Size Required to Install Marinco 15-Amp Power Inlet # 14149
  • The Marinco 15-Amp Power Inlet # 14149 that you referenced requires a mounting hole just under 2-inches in diameter. My digital caliper indicated 1.9 inches is required to allow the threaded portion to fit through the mounting hole. The overall diameter of the mounting flange is 2-1/2-inches. Please refer to the linked photo. This part includes three mounting screws, a dust cap to protect the contacts and a soft plastic cap to protect the connection terminals in the rear.
    view full answer...

  • How to Test the Trailer Light Functions of a Trailer with a 4-Way
  • There is, but I will warn you it's pretty expensive. The Hopkins Tow Doctor Trailer End Test Unit # HM50928 is designed to test the connector on a trailer for function and would be perfect for what you are trying to do. Check out the review video I attached. A much more inexpensive option would be to use a jumper wire from a car battery's positive post to put voltage on all of the pins of your trailer's connector. You would need to test the three male pins next to the female pin....
    view full answer...

  • Is Tinned Wiring Used In Trailer Wiring Kits
  • The trailer wiring we offer like part # W002290, is designed to be used as a 5-wire harness, and works well with a trailer that has a surge coupler. The wires used in this harness are 16 gauge except the blue brake wire which is 18 gauge, and designed to be able to safely handle the current from a 12 volt system. The wires in this harness are not tinned. From my research I found that tinned wire is normally used in industrial wiring and used when the operating temperature of the wire...
    view full answer...

  • Troubleshooting Trailer Wiring That all Blinks When Right Turn Signal is Applied
  • You are having some interesting wiring issues on your trailer. First thing I would recommend you do is check to make sure all of the wires are grounded properly. Ground issues can cause bizarre trailer wiring behavior. Each lamp should be grounded either by its mounting studs being in direct connection with the trailer frame or by each lamp's ground wire being connected to the trailer frame. Next, you will need to inspect the wiring from the connector to the light assemblies looking...
    view full answer...

  • Audi Q5 2015 Trailer Wiring Installation
  • The best installation instructions I can give you for installing the # C56190 on your 2015 Audi Q5 would be to use a circuit tester like part # 3808 to test the wiring harness of the taillights you have on your vehicle and then wire up the # C56190 accordingly by function. Here's how the converter will wire to your taillights. Converter Brown Wire: Tail Light Circuit Converter Yellow Wire: Left Turn Circuit Converter Red Wire: Brake Light Circuit Converter Green Wire: Right Turn Circuit
    view full answer...

  • Compatibility of a Pollak Heavy-Duty 7 Pole Round Pin Trailer Wiring Connector with Blade Connector
  • The Pollak 7-pole round pin part # PK11700 is not compatible with Pollak 7 and 4-pole connector # HM40975 because it has blade style pins. What I recommend is you change your trailer connector to a 7-Way blade connector part # 54-77-003. You will also need a wiring harness like # PK11998 to install the 7/4-Way connector. It plugs into the back of the 4/7-Way. The connector mates with RV-style socket to form a weather tight seal. -Red - Left Turn and Stop - 14 gauge -White - Ground...
    view full answer...

  • Options for Grounding the 7-Way part # 37185
  • The Hopkins # 47345 that you referenced is an adapter that plugs into a vehicle's 7-way and provides a 4-way for a trailer to connect to. There wouldn't be any wiring needed for use with this product so I am sure you are referring to a Hopkins 7-way like part # 37185 or the # ETBC7. If so, running the white wire to the negative post of your battery is one way to do it. Either way it would work fine, but going to the frame of the vehicle would be a bit easier since it wouldn't require...
    view full answer...

  • Trailer Wiring Recommendation for 2012 BMW X3
  • In order to install trailer wiring on your 2012 BMW X3, I recommend taking a look at the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness with Install Kit, # 119190KIT. This kit uses a powered converter with circuit protection to safeguard your vehicle and the module. Although the universal design of this wiring harness enables it to work with most vehicles, this harness has not been specifically tested on the 2012 model by the manufacturer or any of our installers...
    view full answer...

  • How to Confirm Trailer Wiring Configuration to Match 2007 Jeep Grand Cherokee
  • Trailer wiring often uses a particular wire color for a particular function, such as a white wire for ground, but there is no absolute rule that this will be the case. For this reason testing with a circuit tester like # 40376 is recommended. In the case of a trailer you can use a spare battery (or your Grand Cherokee battery) to test each trailer circuit to see what light activates with the 12V input power applied. The linked trailer wiring article illustrates the various connector...
    view full answer...

  • How to Wire up a Tow Vehicle to Tow a Jayco Style Flagstaff Trailer that Needs 12 Volt Power
  • 4-ways like what you have on your tow vehicle do not carry a 12 volt signal. They are designed for only taillight circuits. If you need a 12 volt circuit you are going to have to remove the # 30104 adapter as well as the 6-way square you have on your trailer. You will have to install a 7-way in it's place like part # H20042 and then use the # 37185 on your vehicle. The black wire of the # 37185 will need to get ran through a 40 amp breaker like part # PK54540. The 4-way of your vehicle...
    view full answer...

  • Replacing 4-Pole Trailer Connector on Trailer With 7 Different Circuits Feeding It
  • It sounds like you've got a pretty good handle on what you're dealing with. You're correct, the green is right turn/brake, yellow is left turn/brake, black/green is right taillight and black/yellow is left taillight. The remaining wires are almost certainly grounds. I'm guessing you're not the original owner of the trailer or the person who wired it last time. Rather than grounding each trailer lamp directly to the trailer frame by its mounting studs or individual ground wires connected...
    view full answer...

  • Adapter Recommendation to go from a 4-Way Vehicle Connector to 7-Way Trailer Connector
  • The correct adapter to use to allow you to go from the 4-way connector on your vehicle to the 7-way on your trailer would be the # 30717. The extra wires that come with this would just need to be taped up and out of the way.
    view full answer...

  • 4-Way to 5-Way Adapter Recommendation for a 1997 Toyota Sienna Towing Boat Trailer
  • The part # 20036 would be the best solution I could recommend for you, in order for the fifth circuit to be active you will need to splice it into the correct circuit of your 1997 Toyota Sienna though. If that fifth circuit isn't needed then you wouldn't need to worry about it. But most likely you need it to run to the reverse light circuit of your vehicle to activate a reverse lock out solenoid. I attached an install video for this for you to check out as well to show you how it...
    view full answer...

  • Troubleshooting Trailer Wiring that Blinkers Dont Work When Headlights are On 2007 Toyota 4Runner
  • This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare...
    view full answer...

  • How Does the Tow Ready Trailer Wiring Harness Install on a Lexus GS350 2010
  • To install the Tow Ready Wiring # 119147KIT on your 2010 Lexus GS 350 you will need to test the wires of the taillight harness with the included circuit tester you have found to determine the functions of all of them and then wire the # 119147KIT to the appropriate wires as the instructions and diagram I attached indicate. I wish I had more specific instructions but we haven't had the chance to install this harness on a vehicle like yours so I can't give you more specific instructions...
    view full answer...

  • Can Tekonsha Trailer Wiring Tester # 8010 Detect Faults in an Enclosed Trailer Dome Light
  • The Tekonsha Trailer Wiring Tester # 8010 that you referenced is intended for connection to a trailer's RV-style 7-way blade connector plug. The tester's socket mimics a typical vehicle 7-way. This unit tests the exterior trailer lighting circuits. For your application to test an enclosed trailer's dome light a simpler and more cost-effective tester is the Draw-Tite # 40376 (sold by the same parent company as the Tekonsha). This hand-held probe tester lights up and beeps when it detects...
    view full answer...

  • Problems With Light Functions On Trailer After Installing 7-Way Connector
  • When you are installing a trailer connector like part # PK11893, you can run into issues due to the wires that the vehicle manufacturer used have different colors. This is why we always recommend using a circuit tester like part # 3808 to test the wires on the vehicle side, and make sure the wires on the trailer side connector match by function and not by color. I have attached a helpful article that explains trailer wiring you can check out. In the article there is also a helpful...
    view full answer...

  • Circuit Tester to Test Tail Light Wiring on a 2007 Cadillac SRX
  • There is no way to really know without using a tester. We have a test light that could be used, # 3808. Or a local auto parts store might have one they could loan to you. The only other thing I can thing of would be to disconnect each wire and either see what doesn't turn on or attach a separate light to the wire to see what makes it light up. But the downside is that you could get shocked and you would have to sever the wires to do this type of testing. I have linked a video to the...
    view full answer...

  • Adding a 7-Way Trailer Connector, Junction Box, and LED Lights to a Trailer
  • I think adding a 7-Way and a junction box and not to mention LED lights are great ideas! If you are going to replace all of those items, you may as well go the all out and replace all of the trailer wiring as well. Starting with a trailer side 7-Way connector you can use # H20042 which is 3 feet long. It doesn't have to be long though because it is going to the junction box. Speaking of junction boxes you can use # 38656. I have included a picture showing how it can be wired up and...
    view full answer...

  • Replacing a 4-Way Connector on Trailer with 7 Wires
  • From the information that you have given, I suspect that you have some additional ground wires on your trailer. Without being there to actually see the trailer, my best recommendation would be to wire the connector as follows: Green to Green for Right Turn Yellow to Yellow for Left Turn Yellow/Black and Green/Black to Brown for Running Lights White, White/Black, and Brownish White to White for Ground If the lighting on your trailer still isn't working as it should, I recommend...
    view full answer...

  • 4-Way Adapter and 7-way Recommendation for a 2003 Chevy Silverado
  • The # 47345 that you referenced is designed to plug into an existing 7-way connector at the rear of a vehicle. Based on the two pictures you submitted it looks like you unplugged your current 7-way from it's harness and are trying to plug the # 47345 directly to it. This won't work. To use this adapter you will need to put your 7-way back on the connector. Another option that you might like even better would be to plug the harness you have into a # HM40975 as this will give you a...
    view full answer...

  • 7-Way Round to 4-Way Flat Adapter Recommendation
  • As long as the 7-way round you have on your trailer is wired so that the stop/turn circuits are on the same circuits the # 118709 would be perfect for what you are trying to do. If the 7-way you have is a Euro style that has separate taillight circuits then you would need to make an adapter, but I doubt this is this case. If your 7-way is wired like the diagram I attached you would be good to go.
    view full answer...

  • How to Install a Brake Controller on a Vehicle that has a Factory 4-Way
  • The best way to install a brake controller like the Prodigy P2 part # 90885 on a vehicle like your 2001 Mercedes 320 that has a factory 4-way is to use the # ETBC7 that you purchased as well and install it according to the installation instructions by hardwiring everything. For your vehicle there isn't a simple plug-in adapter available so using the # ETBC7 would be your best option. I attached the installation instructions to the right plus an install video for you to check out.
    view full answer...

  • How to Install a Brake Controller in a 2000 Land Rover Discovery II
  • What you can do is test the wiring of the connector you found with a circuit tester like # 3808 to see if there is a stoplight switch circuit on the harness that you could use to install the Prodigy Brake controller part # 90885, but we do not have a plug in harness that will allow for brake controller installation on your vehicle. If not, then you will need to wire the controller up to the wiring of your brake switch like the install instructions for the # ETBC7 indicate. I would recommend...
    view full answer...

  • Converting US Style 4-Way Trailer Connector to a European Style 7-Way Connector on a Bike Rack
  • In order to get the US style 4-Way to work with the European style 7-Way you are going to have to do a little hardwiring. What you will need is a vehicle side European 7-Way and a special converter, # 118158. You will have to cut off the 4-Way on the vehicle. The wires left over should be white for ground, brown for running lights, yellow for left turn/brake lights, and green for right turn/brake lights. On the input side of the converter match up the wires color for color. Brown will...
    view full answer...

  • Plug and Play Trailer Wiring Harness for 2001 Buick LeSabre
  • There isn't a plug and play option available for the 2001 Buick LeSabre, most likely due to the age of the vehicle and the fact that it's not frequently used to tow. However, there is an available hardwire option. You can use part # 119179KIT, which would wire directly into the wiring harness that feeds your taillights. The best place to tap into your taillight wiring is directly behind the taillight assemblies. Use the included tester to probe the wires feeding the taillights. Have...
    view full answer...

  • Recommended Trailer Wiring Harness for a 2001 Buick LeSabre Limited
  • Since there isn't currently a plug and play option vehicle wiring harness for your 2001 Buick LeSabre Limited, I recommend is our Tow Ready wiring part # 119179KIT. This kit comes with a wiring harness, install kit, circuit tester, quick splice connectors and intergrated 4-pole connector. I highly recommend using dielectric grease to help prevent corrosion from water exposure. Part # 11755. See video of the 2005 Acura at the 2:20 mark. I have included an installation video for...
    view full answer...

  • Availability of Plug-and-Play Trailer Wiring Harness for 2001 Buick LeSabre
  • There isn't a plug and play option available for the 2001 Buick LeSabre, most likely due to the age of the vehicle and the fact that it's not frequently used to tow. However, there is an available hardwire option. You can use part # 119179KIT, which would wire directly into the wiring harness that feeds your taillights. The best place to tap into your taillight wiring is directly behind the taillight assemblies. Use the included tester to probe the wires feeding the taillights. Have...
    view full answer...

  • 4-Way Trailer Wiring Harness For 1989 Honda Accord
  • You are correct. For your 1989 Honda Accord, the correct wiring harness would be the Curt Wiring Harness, part # C56175. The connection points for this harness are located behind the driver side tail lights. This comes with the necessary wire connectors and installation instructions. When installing this harness I recommend a circuit tester like part # 3808 to test the wires on your Accord. When working with electrical connectors I recommend using dielectric grease like part # 11755....
    view full answer...

  • Troubleshooting 7-Way Connector of 2006 Toyota Sequoia With No 12-Volt Feed at 7-Way
  • If your 7-way on your Sequoia was installed at the factory, the 12-volt circuit should be active. Check the fuse box under the hood for a blown or missing fuse. If there's no blown fuse, you trace the 12-volt circuit from the rear of the vehicle looking for a loose connection, but abandoning the original and installing your own circuit as described below might be the simplest course of action. If the 7-way was installed aftermarket, check the terminal for the 12-volt pin at the rear...
    view full answer...

  • Converting a European 7-Way on a 1996 Land Rover Discovery to Work with a US 6-Way
  • There is no adapter to go from a European 7-Way to a US style 6-Way. You will either have to convert the connector on the vehicle or the one on the trailer. It all depends on what works best for you. If you only tow the one trailer then converting the vehicle makes more sense. But if you tow other trailers that need the European 7-Way then converting the trailer makes more sense. To convert the vehicle you will need a vehicle side 6-Way, # PK11609, and you will also need a special...
    view full answer...

  • Installing a 7-Way and Brake Controller on a 1998 Ford Expedition with 4-Way Flat Connector
  • On a 1998 Ford Expedition with a factory 4-Way trailer connector, it is fairly easy to install a 7-Way and a brake controller. All you will need is the 4- to 7-Way adapter and the proper brake controller wiring harness. If you follow the factory 4-Way forward on the vehicle you will come to a point where it plugs into a forward connector. There are more wires going into the forward connector then go out to the 4-Way. On the forward connector and the wiring running to it, pull back the...
    view full answer...

  • How Does Trailer Wiring Install on a 2008 Saab 9-3
  • I attached a set of installation instructions for the wiring kit you have part # 119179KIT to the right. But basically some vehicles (like yours I believe) combine the stop and taillight functions onto one circuit. These vehicles will require that you attach the trailer light power module red stop wire to that same circuit on the vehicle and then ground the brown tail light circuit. Some vehicles combine stop and tail light functions onto 1 circuit and then also have an additional...
    view full answer...

  • Adapter to Mate Round Vehicle Connector with 5-Pole Flat Trailer Connector
  • Most often vehicles with factory- or dealer-installed trailer connectors have a 7-way RV blade style connector, but indeed sometimes a 6-pole round pin socket can be found on vehicles. The part you referenced, Pilot 6 Pole to 5 Pole & 4 Pole Adapter # TC-129, has the correct configuration to adapt your vehicle and boat trailer that has a 5-pole flat connector. Adapters are great for occasional or short-term applications but you may find that over time you'll prefer to replace one of...
    view full answer...

  • Recommended Wiring Harness for a 2015 Volkswagen Golf TSI
  • For a 2015 Volkswagen Golf TSI, I recommend using the Tow Ready upgraded heavy duty modulite circuit protected vehicle wiring harness with install kit, # 119190KIT. I have included an instructon link to the right for you as well. This kit includes everything necessary to hardwire it to your vehicle. A nice feature is the kit has short circuit protection to safeguard itself and the tow vehicle against harmful electrical shorts and mis-wire situations. Another option you can use is the...
    view full answer...

  • Trailer Wiring Recommendation for a 2003 Ford Crown Victoria
  • Yes, the Hopkins Active Taillight Converter with Install Kit # 46255 that you referenced has been confirmed to fit your 2003 Ford Crown Victoria so it would be a great option to use to install trailer wiring. I attached installation instructions to the right for you to check out as well. Another option you have is the part # 119178KIT, this is also confirmed to fit your vehicle. We had the chance to install this wiring kit in a very similar 2003 Crown Vic as yours and shot an install...
    view full answer...

  • How to Make an Adapter that Will Go From a 7-Way Round Connector to 7-Way Flat RV
  • The problem that you will encounter that would prevent the # PK12-724 from being the correct adapter to use is that round 7-way wiring is designed where the brake and turn signals are on separate bulbs and typically RV style taillights are combined where the brake lights and turn signals are on the same circuit. If your trailer with the 7-way flat happens to have separate trailer wiring the # PK12-724 would work, but most likely it doesn't. Or, if your heavy duty 7-way round has combined...
    view full answer...

  • Wiring 12-Volt Accessory Circuit to 7-Way Trailer Connector on 1997 Chevrolet 3500 Cab and Chassis
  • I believe the remaining wire you're speaking of is actually light blue, and is meant to provide power for a third brake light installed on a camper shell. If you want to run a 12-volt accessory power circuit, you can run it from the positive battery terminal to the 7-way. Your truck MIGHT have a 12-volt accessory wire ran already...you'd just need to make the connections on each end. Look on the driver's side frame rail at the rear of the truck. You're looking for an orange wire. If...
    view full answer...

  • Turn Signal Not Working when Using Brakes and Using Hopkins 40955 Wiring Kit
  • Since you have a new trailer connector on your vehicle that tells us that the issue is likely on the trailer somewhere and it sounds to me like it is a bad ground. Make sure all your ground connections are good and clean. There will be a ground connection coming from the trailer connector to somewhere on the trailer tongue and each of your trailer lights should have a ground connection through either a ground wire ran to the trailer frame or grounded through a mounting stud on the light...
    view full answer...

  • Solutions for 2010 Range Rover that Doesn't Detect LED Trailer Lights
  • Normally for the problem you are describing we recommend the # TR20141 as it is designed to fix the problem you are describing, but we have found that this product does not work on Range Rovers for some reason. The best recommendation I could make for you would be to replace the lights on your trailer with incandescent bulbs or install load resistors on the trailer lighting circuits like part # P230004A-2. I attached a link to the right that has all of the trailer lights we offer...
    view full answer...

  • Troubleshooting a Trailer Right Brake Light Won't Function
  • It sounds like the problem is on the trailer and is ground related. I would inspect the grounds of the light assembly you have installed on the right side of your trailer and make sure it is connected to a clean metal surface. A lot of assemblies ground through their mounting hardware so you will want to make sure that the assemblies are connected to a clean metal surface. The brake lights will require a better ground than the blinker since it only illuminates one circuit for the blinker. I...
    view full answer...

  • 4-Way to 5-Way Adapter Recommendation for a Ford F-150 Towing Trailer with 5-Way
  • It sounds like you have a Wesbar 5-way flat on your trailer and are looking for a way to convert the 4-way on your F-150 to work with it. What you will want is the part # 20036. This will plug into the 4-way on your truck and will have a 5th wire that will need to tap into the reverse lights of your vehicle if the 5th circuit on your trailer is for reverse lights or reverse lock out. I attached an install video for this product for you to check out as well.
    view full answer...

  • Troubleshooting a 2013 Ford Escape that Hyper Flashes When Connected to Trailer with LED Lights
  • You have a couple options to solve the hyperflashing problem you are experiencing with your 2013 Ford Escape when towing your RV. You can either use a product like the part # C57003 or you can take your vehicle to a Ford dealer and they will do a software update on your vehicle which should fix the problem. There should be a technical service bulletin that said that trailers with LED taillights can cause the Escapes to hyper flash and they can fix it if you bring the vehicle in to them.
    view full answer...

  • Trailer Connector on 1994 Ford F-250 Only has 12 Volt Power on the Center Pin
  • If it is really a 6-Way and not a 7-Way blade style trailer connector then the center pin being hot would indicate that particular pin is the 12 volt power circuit. But the other functions not working could mean that tow package wiring fuses and/or relays are missing or need to be replaced. Check the truck owners manual to find the locations of any and all fuses related to the tow package wiring. If the wiring was added and is not factory then you will need to check the wiring connections...
    view full answer...

  • Changing a US Style 7-Way Vehicle Connector to a European Style 7-Way Connector
  • The European 7-Way does the same thing that the US 4-Way does. There isn't an adapter available because the European 7-Way has separate circuits for nearly every function on each side of the trailer. The US style 4 or 7-Way has combined brake lights and turn signals. What you will have to do is change over the US style 7-Way to a European one. You will need 1 European style vehicle side 7-Way and one special converter that separates the combined signals to separate ones. You will...
    view full answer...

  • Trailer Brake and Tail Lights Go Out when Headlights on 2000 Chevy Silverado Come On
  • This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare...
    view full answer...

  • What is the Diameter of the Cable on Hopkins 7-Way Molded Trailer Wire Connector # HM20048
  • On the Hopkins 7-Way Molded Trailer Wire Connector # HM20048 the outer diameter of the cable is 5/8 inches. On the inside the green, yellow, brown, and purple wires are 16 gauge and the white, blue, and red wires are 12 gauge.
    view full answer...

  • Converting a 6-Way Rectangle Plug on a Monaco Diplomat to a 4-Way Flat for a Boat Trailer
  • The 6-Way square trailer connector is not used by a lot of trailer manufacturers. A lot of Jayco trailers may have them but mostly you come across the 4-Way flat, like what you have on your trailer, and the 7-Way blade for RV applications. What I recommend is to convert the 6-Pole on the Monaco to a 4-Way. You can do this very easily by removing the 6-Way plug, and then testing the wires for function using a circuit tester like # 3808 if needed before installing them in a new 4-Way,...
    view full answer...

  • Trailer Lights are Erratic After Switching to LED Lights
  • Jesus is a good driver, but not a trailer expert. And that's ok because your trailer is not possessed . . . well, it could be, but that is not what is causing this problem. What you have here is a ground problem. Ground problems can cause all sorts of funky things to happen. The good news is ground problems are usually very easy to fix. The bad news is that you have to find the problem before you can fix it. Ground problems normally show up when there is more draw on a system such as...
    view full answer...

  • LED Trailer Lamps Stay Illuminated When Tow Vehicle is Shut Off
  • When the tow vehicle is shut off, the only pin on its 7-way trailer connector that should show any power is the 12-volt accessory circuit, which is the pin in the 1:00 position. If the trailer lights are illuminating when the tow vehicle is shut off, the only possibility is that there's a small short either in the 7-way connector or in your adapter that is allowing some power from the 12-volt accessory circuit to bleed over into one of the lighting circuits. With the vehicle shut off,...
    view full answer...

  • Recommended Ways to Power a Winch on a Trailer
  • The best way to power the winch on your trailer would be to have a large battery installed on the trailer that will power the winch and then use the 12 volt accessory circuit from the 7-way on your truck to put a maintenance charge on the battery. Or if you have a Superwinch brand winch with up to a 16.5k capacity you could get the Trailer and Vehicle Electric Winch Wiring Kit, for up to 16.5K Winches # SW2008. This sounds more like what you would want. This will run a power wire from...
    view full answer...

  • Trailer Lights Go Out When 2002 GMC Yukon Headlights are Turned On
  • This sounds like 1 of 2 things. Either a bad ground or the vehicle side wiring is being overloaded (which can happen if there are a lot of lights on the trailer). Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be...
    view full answer...










Stay Connected


Subscribe to email newsletter

Email  

privacy - we don't send unsolicited email






etrailer.com reviewsetrailer.com reviews

All images, layout and content copyright etrailer.com