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Trailer Wiring Harness

Make installing your trailer wiring harness as easy as possible with a custom fit wiring harness. Trailer wiring from Draw-Tite, Curt, Pollak, Tow Ready, Bosal, and Hopkins eliminates or reduces the need to cut and splice wires. It also helps to protect your vehicle's sensitive electronics from mis-wired trailers.

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Custom Fit Vehicle Wiring Information Videos

Trailer Wiring Harnesses Troubleshooting

Today we are going to cover kind of a different subject. Basically, we are going to talk about getting your wiring installed and what is happening afterward. Okay, for instance, you went to the trouble to get your wiring installed, you plug it into your trailer, and nothing happens. There could be a lot of different things going on with it. First off, you need to figure out for sure whether it is on the towing vehicle side - the car or truck - or if it is something on the trailer. We will show you how to test the different types of wiring systems we have shown here. And that way you can tell for sure if it is your wiring harness or if it is your trailer.


How To Differentiate a Two Wire and Three Wire System

Today we are going to do the Frequently Asked Questions of what is the difference between a three wire system and a two wire system. It is actually very easy and very simple. All it is, is you take away two wires and the same thing applies to the four and five wire system. Starting off on the car side we are going to attach the wiring to, we are going to have five wires. Green is going to be right turn, red is going to be the brake signal, yellow is going to be left turn, brown is going to be your running lights, and the white is going to be ground. When you talk about the three wire system you are only talking about the right turn, the brake signal, and the left turn. You omit the brown wire and the white wire. That is our three. On the two wire system you are only dealing with the two combined signals, the brake signal and the turn signal on the same wire. We are only dealing with the left and right turn. 00:46


Trailer Wiring Harness Installation - 2006 Kia Sedona

Today were going to show you a popular upgrade. We have here a four pole flat that has been installed on a vehicle. The owner has a boat trailer now and it has a five wire flat. So were going to convert that four wire to a five wire flat. We will show you how to deal with part number 20036 which is the adapter itself, and the bracket which is part number 20046. Our first step we need to do is take off the four pole and then well uninstall the bracket and put in the new bracket. It may take some force, but you have to pull to get this out of here. We actually used a rubber mallet to tap it a little bit, now this bracket can come off which we have previously loosened up. Now well install our new bracket and it will go in the same spot as before. What were going to do next is get our four pole ready which we have cleaned out with WD-40 and then were going to put in some dielectric grease. Well put that inside here and then were going to attach our four pole from our adapter inside there.


Testing and Troubleshooting a Modulite Vehicle Wiring Harness

All right today we are going to go over how to check over a modulite as shown right here which converts a 5 wire to a 4 wire system. We are going to go over the basics which are really simple. Basically we are just going to test input into the modulite and test the output of the modulite. That will tell us one of two things, we have no input going into the modulite, that means there is something wrong on the car side of the connector, there is nothing wrong with the modulite. If you have power going into it, but nothing coming out then you know chances are it is the modulite or there is a problem on the trailer itself. When testing you always want to test these modulites or converter boxes without the trailer hooked up first.


T-One Wiring Harness Explanation

Today we are going to show you a little bit of wiring. Basically kind of like wiring 101 and what to look for when your going to hardwire into the vehicle. What hardwire means is actually getting to the wire and splicing into them to make a connection. T1 connectors are different. They actually have a connection point and harness which you take apart and fit the T in the middle of that. Now on this vehicle we will show you the typical wiring schematics and a couple variants from that. The typical connection point is like where this wiring comes into the back of the tail light and there is always going to be a connection point, almost always. Older vehicles, it would have just ran straight, but with pretty much of your newer vehicles you are always going to have a snap connection like this. Basically a T1 connector simply would just go ahead and fit in between this harness.


How To Troubleshoot a Modulite Demo

Today we are going to troubleshoot a modulite that is not really working so we will check it out and show you what to look for. This will apply to all modulites and this will also apply to converter boxes as well. The only difference being that it does not have a power wire for a converter box. The first thing we want to do is put a tester on the 4-pole just to make sure. We will hook up our ground to our ground lead and then we will turn on the left turn signal which we have going, we have got nothing. You can turn on the other signals and see what we have got, nothing here. Try the running light circuit, nothing here either. 00:28


Hot Lead Fuse Installation

Today on our 2005 Chevy Silverado, we are going to hook up the hot lead for the seven pull connecter at the back of the truck. To do this well simply remove the fuse box cover and the first position, on the first row is a blank fuse, we are going to remove it and install a 30 amp fuse. With that fuse installed, we can go ahead and replace the cover and were now hot at our seven pull connector. There you have it with the install of the hot lead fuse on our 2005 Chevy Silverado.




Custom Fit Vehicle Wiring Videos


Trailer Wiring Harness Installation - 2014 Jeep Patriot

Today on our 2014 Jeep Patriot, we're going to be installing the Curt T Connector Vehicle Wiring Harness with the four pole flat trailer connector, part number C56162. We'll begin by opening our rear hatch up and we're going to remove the two push pin connectors located here on the passenger side and in the same spot on the driver's side. A small screwdriver, if you have it a small pick is really all you need to just kind of pry the center of that fastener up and then we'll pull the main body of it out. We'll do it for both connection points on this side. Sometimes the centers will pop out. Not a big deal, you can just poke it right back in there. Now at this point, it's going to tell you to remove both rear lenses and unplug the connectors from the rear. We're going to do them one at a time.


Trailer Wiring Harness Installation - 2015 Toyota Highlander

Today on this 2015 Toyota Highlander, we're going to show you part number C56216. This is the Curt T-Connector Vehicle Wiring Harness with a 4-pole flat trailer connector. These are the parts that you get with it. First off, this is our module with a fuse holder. This will plug into a preexisting port at the back of the vehicle. This is the 4-pole wiring harness here and it has its own port that it plugs into at the back of the vehicle.


Trailer Wiring Harness Installation - 2011 Nissan Frontier

Today on our 2011 Nissan Frontier we're going to be installing the Tow Ready Replacement OEM Tow Package Wiring Harness. This is a seven-way plug, part number is 118267. This is a really simple, easy to do installation. As you can see mounted underneath the rear of the vehicle we're going to have a black plug and a gray plug. Typically they're going to have a little cap in them. For some reason those we're already removed. You just have to pull out the cap by pressing in on the tab located on each one and then just sliding it out. Once we have those out we'll just take our color-coded connectors and slide them right in being sure that we squeeze them all the way together and we hear a click.


Trailer Wiring Harness Installation - 2003 Chevrolet Silverado

Today, on our 2003 Chevrolet Silverado, we'll be installing the Curt Custom Fit Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part number C55515. Well firstly, we locate the manufacturer's round seven-wire connector. Note, if your vehicle is equipped to the spare tire, you may need to lower the spare tire to gain access to the wiring. To this application, we don't have a spare tire in the way so we'll go ahead and locate the wiring. Here on the cross member of the frame rail, let me just pull it down as it's clipped to the wiring harness. We now have access to it. We'll then go ahead, press on the locking tab or we can remove the cap. Once we removed the cap, we're ready to install the new 4-pole trailer connector.


Curt Custom Fit Vehicle Wiring C56267 Review

Today, we're going to be reviewing part C56267 this is the Curt T-Connector Vehicle Wiring Harness with a 4-Pole Flat Trailer Connector, that's going to be this portion here. Now, this is a custom fit design, it's designed to fit the Nissan Murano's beginning with year 2015. Now, double check and make sure this fits your particular year, make, and model you can use the vehicle fit guide, located right here on our website. This system is a great system to have in place. It's going to provide a 4-way flat trailer connector at the back of your vehicle and that's designed to power your trailers signal lights. It's going to be compatible with 5-Pole, 6-Pole, and 7-Pole adapters, but those are going to be sold separately. A great advantage to the T-connecting system is that it connects quickly and easily so there's not going to be any cutting or splicing of your wires that are going to be required for a complete installation.



Articles about Custom Fit Vehicle Wiring



Custom Fit Vehicle Wiring Questions and Answers

  • Could Just the Converter Box of the # 118379 get Wired In to Replace Old Converter
  • Yes, if your # 118379 was damaged and you wanted to just replace the converter box you could cut the bad box out and then wire in just the converter of a new # 118379. You could use butt-end connectors like part # DW05714 or solder them in. It would be just a matter of matching the wires color for color.
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  • Trailer Wiring Harness Installation Tips for a 2014 Volkswagen Tiguan, Remove Taillights
  • The recommended trailer wiring harness for your 2014 Volkswagen Tiguan is the Tow Ready harness part # 119190KIT. This is a universal harness designed to fit several vehicles. The install video you referenced that I have also attached is a guide that will give you an idea of how the harness would install on your vehicle. We had a customer install this harness on a 2013 Tiguan who offered the following advice: If you have a Tiguan, use the VW-supplied tool to help remove the rear lights....
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  • Troubleshooting a Vehicle that Trailer Wiring Stopped Working After Installing LED Taillights
  • The converter box of your wiring harness is looking for the amount of amperage on the circuits that is associated with incandescent bulbs. Since you switch to LEDs that draw considerably less the trailer wiring isn't functioning. You can either go back to your incandescent bulbs to fix the problem or you can install a different taillight harness like part # 119190KIT that is designed to work with LED taillights.
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  • Troubleshooting Trailer Wiring Harness on 2007 Dodge Magnum with Always-On Left Brake Light
  • You did indeed purchase a trailer hitch from etrailer back in January of this year but I did not find a record of a wiring harness purchase. In any case the problem you describe is most likely caused by either a damaged wiring harness or by a bad connector at the vehicle or trailer. I suggest you first check that the ground wire is firmly attached to a clean bare metal surface. A bad ground can cause all sorts of weird issues. If this does not help next disconnect the harness connectors...
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  • Re-Wired Cattle Trailer Lights Go Out When Brakes on 2002 GMC Sierra are Applied
  • Since your truck came with a factory trailer connector I suggest you avoid the hassle and potential for problems by completely skipping the 7-way to 4-pole adapter. You can install Hopkins # 30955 in place of your factory 7-way and this will give you BOTH a 7-way and a 4-pole at the truck - with no adapter needed. Adapters are handy but are not a great solution for the long run. This Hopkins harness plugs in at your existing round connector at the bumper. With the truck being 13-years-old...
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  • Blower Fan for Heater/AC is Not Working, Do All Relays and Fuses have to be In Place for It to Work
  • Relays control specific functions so if one is not in place or blown then only the functions associated with it would not work. What I recommend is to consult the vehicle owners manual for all of the fuse and relay locations so you can check the affected ones related to the circuits that are not working to determine what is missing or blown. Relays are harder to check than fuses. The easiest way to check to see if a relay is bad is to use a known working relay in place of a potential...
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  • Can Unused Red Wire on Curt Trailer Wiring Harness Just be Cut Off
  • On certain applications, the red wire on Curt trailer wiring harness # 56146KIT does have to be grounded with the white wire since it isn't used in all applications. But you wouldn't want to cut it because that could potentially void its warranty. Since it is an input wire you are correct that it would not be hot (unless there was some sort of catastrophic short inside the converter box).
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  • Can Wiring Harness # 118433 from 2010 Hyundai Sonata Fit 2014 Sonata Non-Hybrid Model
  • Thank you for your 2011 purchase of a wiring harness. That actual part you ordered is Tow Ready harness # 118433 which is intended for 2006 through 2009 model years of the Sonata. It is not a confirmed fit for the 2010 Sonata, please note. The recommended harness for your 2014 Hyundai Sonata non-hybrid is Curt # C56049 which is shown in the linked video. This harness installs without any cutting or splicing of wires thanks to its custom-fit connectors. There is no resetting function...
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  • Recommended Trailer Wiring Harness For 2015 Jeep Grand Cherokee Without Factory Tow Package
  • We do have a trailer connector for your 2015 Jeep Grand Cherokee without the factory tow package. You will need to look under the rear inner bumper and should find the round trailer connector on your Jeep. You can then use part # 20119. It simply plugs into the connector you find. This will give you a 4-way and 7-way trailer connector at the rear of your Jeep. This connector comes with the mounting bracket and hardware needed. I have attached a product review video you can check out....
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  • Trailer Wiring Harness Recommendation for 2016 Kia Sorento
  • Yes, for your 2016 Kia Sorento you would want the Curt Wiring Harness part # C56151 as long as your vehicle is a V6 model with factory tow package. I attached an install video for you to check out as well.
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  • Installation Instructions for the Tow Ready Wiring Harness part # 118566 for a 2012 Chevy Camaro
  • Check out the link I attached to this page that will take you to the installation instructions for the Tow Ready Wiring Harness part # 118556 that you bought.
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  • Trailer Wiring Harness Recommendation for a 2005 Acura TSX
  • For your 2005 Acura TSX the only wiring kit I can safely recommend for you is the part # 119179KIT as the part # 118302 has not been confirmed to fit your vehicle.
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  • Why Would Trailer Taillights Only Work When Trailer Coupler Is Touching Ball Mount
  • It sounds like your trailer wiring is grounding through the coupler, to the ball mount, and then to the hitch and frame of your vehicle. This is a pretty common occurrence as a lot of trailer wiring setups aren't grounded sufficiently. It would be a good idea for you to run jumper wires from each of the light assemblies on your trailer to the main ground of your trailer. Since couplers move around a bit on hitch balls your current setup might cause erratic light operation if the grounds...
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  • Recommended Trailer Wiring Harness for 1998 Holiday Rambler
  • Your 1998 Holiday Rambler shouldn't require a special converter but if the installation was completed per the instructions and this is the second unpowered converter that you have tried, I recommend trying a powered converter with circuit protection like the Tow Ready, # 119190KIT. With a powered converter the power is drawn directly from the vehicle's battery which virtually eliminates any draw on the taillight circuit.
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  • Curt Trailer Wiring harness on 2010 Toyota RAV4 Shows Power Even with Vehicle Off
  • What you are describing seems to be common in some Curt trailer wiring harnesses that use a powered converter such as # C56165. If you were to pull the fuse out of the fuse holder it should not show power any more (with the vehicle on or off). If that happens then that is exactly the issue. It would only be a problem if you left the trailer connected or anything that would draw power. If it happens even with the fuse pulled then there is some sort of wiring issue on the vehicle, a short...
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  • Trailer Wiring Harness Recommendation for a 2002 Mercedes Benz M-Class
  • The Curt Wiring Harness part # 56146KIT that you referenced is a universal fit wiring kit designed to fit your 2002 Mercedes M-Class as well as the VW in the product picture. I attached an install video that shows this wiring kit being installed on a very similar M-Class as yours for you to check out as well.
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  • 7-Way Recommendation for a 2009 Ford E-350 Van
  • The connectors that the # 118261 is designed to fit should look like the picture that I attached. It is possible that you haven't found the correct harnesses on your 2009 Ford E-350 Van. The correct harness will be under the rear of the van inside the driver's side frame rail. See attached pic. I attached a link to our returns policy page as well.
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  • 7-Way and Brake Controller Recommendation for a 2010 Ford F-150 STX
  • Since you have the square trailer wiring connector under the rear of your 2010 Ford F-150 you will want to use a circuit tester like part # 3808 to test the pins of if for voltage with different taillight circuits activated. If the circuits are activated you would want to use the part # C56110 as a 4-way and the start of your trailer wiring. If the circuits aren't active you instead would want the # 18252 for a 4-way. From there you would need to convert the 4-way to a 7-way so that...
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  • Trailer Hitch for a 2016 Acura MDX
  • None of the wiring harnesses currently available are confirmed to fit the 2016 Acura MDX. Currently we only show a trailer hitch, # C13146, but no wiring yet. If you need wiring right away I would inquire with an Acura dealer. We do have everything else you would need though including the trailer hitch listed above. I also recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It...
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  • Trailer Running Lights Do Not Operate with TowReady 4-Pole Wiring Harness # 118610 in 2014 Prius V
  • Thank you for your purchase last year of a TowReady wiring harness # 118610 for your 2014 Toyota Prius V. Also thanks for the troubleshooting details you included. Since the trailer lights work fine with another vehicle and your running light fuse on the Prius is okay it does sound like the harness, or the vehicle wiring leading to it, are the issue. The easiest way to check your harness is to test the brown running light wire on the input side (the wire that runs with the yellow) and...
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