Trailer Wiring

Select Year

Trailer Wiring

Custom fit Trailer Wiring for your:

Available Years for Trailer Wiring

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.

Choose the year of your vehicle to the left to find a custom fit trailer wiring harness.

What our customers are saying:

Great experience. Ordered what I needed and received correct items in a very timely manner. Thanks!


Spokane, WA

Wiring Adapter Fitguide

Trailer Connectors and Adapters

Wire and Wiring Accessories

Trailer Wiring Manufacturers

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.

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

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.

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 Ford Fusion

Today on our 2014 Ford Fusion, we're going to be taking a look at the Curt 4-pole flat trailer connector, part number C56178. This is what our wiring is going to look like installed. It is going to stay inside the trunk at all times and what I like to do is simple put it underneath my mat or put it down by the spare tire and whenever I'm ready to use it, simple grab a little bit of wire, stay away from the center, make sure. As you can see, the weather stripping, it has a little bit of give so when you go to close your trunk, it's not going to hurt the wire and we can still pull our wire out to get as much or as little as we need to connect to our trailer. This is going to be everything that comes in the kit, and one of the nice features of this kit is the box. The converter box is going to keep any problems that may happen with your trailer from effecting your vehicle. Another nice feature is the T-connectors.

Trailer Wiring Harness Installation - 2015 Ford Transit Connect

Today on our 2015 Ford Transit Connect, we're gonna take a look at and also show you how to install the Techancha T1 vehicle wiring harness with a four pole flat trailer connector. Part number is 118613. Right now here's what our wiring gets going to look like when we pull it out of the package. This is a really pretty straightforward system to get installed. Of course here is our goal, ending up with a working four pole trailer connector. This is going to give us right turn and brake, left turn and brake, and a running light signal.

Hopkins Custom Fit Vehicle Wiring HM11143875 Review

Today we're going to take a look at the Hopkins Plug-In simple vehicle wiring harness with the four way flat trailer connector. Now, this is a custom fit part, it is designed to fit a 2003 to 2006 Subaru Baja, and on a custom fit part I always like to recommend for you to go to our website, use our fit guide, put in your year and model vehicle, and it'll show you if this part will work for your application. Now, this harness will provide this four way flat trailer connector at the back of your vehicle to power your trailers signal lights. It is compatible with five pole, six pole, and seven pole adapters that we do sell separately. To install this, it connects very quickly and easily. There's no cutting or slicing of wires. Basically, just locate your connection point, which on that vehicle is underneath the passenger side rear of the vehicle, near the vehicle vapor canister, and there'll be a six pin connector that'll match this one right here. Plug in your connector, attach your box, here, to a nice flat location using the included zip ties, and then run this out to the back to plug into your trailer. Now, this converter box - this is a taillight converter.

Trailer Wiring Harness Installation - 2016 Ford Transit T350

Today on our 2016 Ford Transit T-350, we're going to take a look at and show you how to install the Tekonsha T1 vehicle wiring harness with a four pole flat trailer connector. Part number is 118722. To begin our installation we'll open up the rear hatch here and we're going to pull the screw located right here and the one located right here so we can get this housing off of the vehicle. We'll do that with a T-25 Torx bit. Now we want to kind of pull kind of straight back on the light. There's a couple of pressure clips here we need to separate.

Best 2017 Honda Pilot Trailer Wiring Options

Today we're going to be comparing for you the differences in the custom fit vehicle wiring options available for the 2017 Honda Pilot. Now the wiring systems we're going to be comparing today are going to be two four pole systems, one from Curt. This is part number C56291, and one from Tekonsha. This is part number 118679. These give us the basic signals that we need, like our right turn and brake, our left turn and brake, and a taillight signal. Once we move over to the next one, this is going to offer a seven pole design.

Best 2016 Honda Pilot Trailer Wiring Options

Today, we're going to be comparing for you the differences in the custom-fit vehicle wiring options available for the 2016 Honda Pilot. The wiring systems we're going to be comparing today are going to be two 4-pole systems, one from Curt. This is part number C56291, and one from Tekonsha, this is part number 118679. These gives us the basic signals that we need, like our right turn and brake, our left turn and brake, and a tail light signal. Once we move over to the next one, this is going to offer us 7-pole design. Now, the 7-pole gives us the same three, but we're going to add a reverse light signal. We're going to add a 12-volt power signal, and if you decide to, you can also wire a brake controller up to the system. That part number from Tekonsha is 118274. The basic systems here are going to deliver for us the lights that we need for maybe a cargo carrier, maybe a small trailer, even a boat trailer, something like that.

Hopkins Endurance Fifth Wheel Wiring Harness Installation - 2016 Ram 2500

Today, on our 2016 Ram 2,500, we'll be having a look at and installing the Hopkins Endurance fifth wheel gooseneck, 90-degree wiring harness with a seven-pole plug, part number 41157. Here's what our seven-way connector looks like installed. As you can see, it's readily accessible and easy for us to operate. Our door opens more than 180 degrees, making it really easy to plug in to your trailer. We have this nice foam gasket seal right here to keep the elements out of the connector, making sure we don't have any corrosion buildup on our terminals inside. We also have this nice latch here to help hold your seven-way plug into the connector when you're hooked up to your trailer. This will give us all the functions we need in order to tow our gooseneck or fifth wheel trail without having a cable draped over the tailgate, plugged into the factory connector on the bumper.

Best 2007 GMC Acadia Trailer Wiring Options

Today on the 2007 GMC Acadia, we're going to take a look at the best wiring options available. First off, we're going to have two different styles. We're going to have two from Tekonsha and two from Kirk. One style is going to be for vehicles that don't have an OEM wiring tow package on them and the other set is going to be for vehicles that do have the OEM tow package. Let's go ahead and look at these two guys first. This is probably the most common out there first off our Tekonsha, this is going to be part number 118451. The other one from Kirk is going to be C56056. Let's go ahead and switch over to our two other wire harnesses that we'll plug into OEM wire harness.

Best 2013 Jeep Grand Cherokee Trailer Wiring Options

Today on our 2013 Jeep Grand Cherokee we'll be looking at our best trailer wiring options. All right, we have two wiring harnesses here today. Both of these provide us with a four-pole flat trailer connector. Right here we have the Tekonsha T-One vehicle wiring harness, part number 118425. Now over here we have the CURT T-Connector, part number C56009. The biggest difference that we found between our two wiring harnesses here, besides the fact that they come from different brands, is our dust covers. Our dust cover on the Tekonsha is molded into the end of our four-pole flat here so you don't have to worry about it falling off, whereas on our CURT here, it's a separate piece that slides over the end of your connector here, down the wire a little bit, and then folds back over.

Articles about Custom Fit Vehicle Wiring

About Us
photos and videos

Original Photos & Videos

Produced to make sure you know what you are getting and you get exactly what you need.


Installations Completed

To make sure products work and fit the way they are supposed to.

etrailer call center

Phone Calls & Emails Answered

1,125,924 phone calls and 1,350,587 emails to help find the right solution.

etrailer training

Average Hours of Product Training

We get to know our products firsthand so experts can better help you.

etrailer service

Years of Quality Customer Service

Assisting our neighbors and customers, face to face at the counter.

etrailer experts

Pages of Expert Information

Created to make sure you have all the answers to your questions, from real experts.