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Trailer Wiring

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1979 Toyota Corona

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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

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.


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.


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

Curt T-Connector Vehicle Wiring Harness Installation - 2011 Hyundai Sonata

Shane: Hi. I'm Shane with etrailer.com. Today, you're going to be taking a look at, I'm going to walk you through the installation on the Curt T-Connector Vehicle Wiring Harness 4-Pole Flat Trailer Connector on your 2011 Hyundai Sonata. This wiring kit is going to be very easy to install. It's going to plug directly into the factory wiring behind each tail light. You'll have your ground wire you have to mount.It's going to have a converter box, and what this does is it protects your factory wiring from any back feed from the trailer if there is a wiring issue.


Tekonsha T-One Vehicle Wiring Harness Installation - 2019 Toyota RAV4

Shane: Hi, I'm Shane with etrailer.com. Today you're going to be taking a look, I'm going to walk you through the installation of the Tekonsha T1 vehicle wiring harness with four pole flat trailer connector on your 2019 Toyota RAV4.There's a lot of good reasons to add wiring to your vehicle. Maybe you have a cargo carrier that's going to require lights. Maybe you just bought a trailer. Maybe you have a small camper that you want to tow. Four pole wiring is going to give you all the proper lighting functions, so you can safely tow all your trailers or use that cargo carrier.


Review of Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - 118810

Today, we'll be taking a look at the Y1 Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. This is going to give you all the basic wiring functions that you need to tow a trailer down the road and this is going to be a custom fit for the 2020 Toyota Corolla Sedan. It's going to just fit right in line with our existing wiring, so there's no cutting or splicing required with this. You don't have to worry about it causing any damage to your vehicle's wiring.It's a pretty easy install. You just remove the back panel in the trunk area, you'd just pop up that floor covering, open up the side carpet panel area, and then you should see a connector that will match with these. The green and red wires will go to your passenger side and the yellow and brown will go to your driver's side.


Tekonsha T-One Vehicle Wiring Harness Installation - 2016 Cadillac SRX

Ryan: Hey everybody, Ryan here at etrailer.com. Today on our 2016 Cadillac SRX, we're going to be taking a look at, and showing you how to install the Tekonsha T1 vehicle wiring harness for a factory tow package. Now typically you would have a hitch right here, but in this particular situation it's a lot easier to install your wiring first. But once your hitches in place, what you could do is attach your wiring to that hitch using a number of different brackets that are available. Or what you could even do is use your dust cap and wrap it around your safety chain openings to secure it that way.Many of our customers have questions in regards to which wiring kit to get, because there are a handful out options out there. However, if you do have the factory tow package like we do, I really like this option because it's simply just plugs right in.


Curt T-Connector Vehicle Wiring Harness Installation - 2016 Cadillac SRX

Ryan: Hey everybody. Ryan here, at etrailer.com. Today on our 2016 Cadillac SRX we're going to be taking a look at and showing you how to install the Curt T-Connector Vehicle Wiring Harness.Our wiring is going to provide us with all the necessary lighting functions to remain safe and legal as we tow our trailer down the road.Now when it comes to wiring for our SRX, there is going to be multiple options out there. This is going to be a great choice if you have a factory tow package because this is going to plug into the factory connector right up here behind our bumper. It's also going to have a dust cap, and that will go over our plug, and help protect it from the elements, such as rust and corrosion. I'm going to go a step further to help keep your terminals in good shape, it's not a bad idea to apply some dielectric grease to them every now and again.Now there's many different options available when it comes to mounting your wiring.


Hopkins Plug-In Simple Wiring Harness Installation - 2016 Cadillac SRX

Ryan: Hey everybody Ryan here at etrailer.com. Today on our 2016 Cadillac SRX, we're going to be taking a look at and showing you how to install the Hopkins Plug-In simple wiring harness for factory tow packages. Now right off the bat, first thing I do want to point out is that typically you would have your hitch right here already in place. But since this wiring is so much more convenient and easier to install with the hitch removed, it's a good idea to put this in first. However, once you have it in, your hitch can easily be put in place, and then you'd be able to mount your wiring to your hitch using some brackets that are available here at Etrailer. Or what you could even do is use your dulce cap, wrap it around the safety chain loop on your hitch and secure it that way.


Tekonsha T-One Vehicle Wiring Harness Installation - 2017 Nissan Maxima

Rob: Rob here, at etrailer.com. Today you're going to be taking a look at the Tekonsha T-One Vehicle Wiring Harness, on our 2017 Nissan Maxima. Here's what our wiring it's going to look like once we have it installed. Now this is going to provide us with all of our lighting functions, like our taillights, our turn signals and our stoplights, so whenever we're towing a trailer or anything that has lights on it, we'll be able to let everybody know around us, what's going on, and we can safely get down the road.Our four-pole wiring is going to have a dust cap that's permanently attached, so it'll keep out all the dust, debris and moisture from getting inside the connector. However, our wiring is designed to stay on the inside of the car until we're ready to use it. Whenever we do want to tow, we're simply just going to drop our wire out the trunk, we can hook up our trailer and close everything up.


Tekonsha Upgraded Modulite Vehicle Wiring Harness Kit Installation - 2019 Toyota RAV4

Hi there, RAV4 owners. Today on your 2019 RAV4, we're going to be taking a look at and showing you how to install the Tekonsha's Modulite Vehicle Wiring Harness Kit.This is what your tail light wiring is going to look like when it's installed. All your components are hidden inside the vehicle, so you'll just have your four-pole flat trailer connector here at the back. Your four-pole flat trailer connector will provide you with all the necessary lighting you need to tow your trailer, including your left turn signal, right turn signal, tail lamps, and brake lamps, keeping you DOT compliant in all states.What's nice about this particular unit is that it uses a module to produce all of the signals back here at your four-pole connector. The module monitors all the signals on your vehicle. The module has its own power wire to be able to produce these signals.


Tekonsha T-One Vehicle Wiring Harness Installation - 2014 Nissan NV200

Hi there, Nissan owners. Today, on your 2014 Nissan NV200, we're going to be taking a look at and showing you how to install Tekonsha's T1 vehicle wiring harness.And this is what your wiring is going to look like when it's installed. We've currently got it in the use position where it's outside the vehicle. And we've got it secured to our hitch using the included dust cap. The dust cap keeps out any dirt, debris, and moisture, and can keep it up off the road when not in use.At the end of our harness we'll have a four flat connection and this will provide you with all the necessary lighting including your left turn signal, right turn signal, tail lamps and brake lamps, keeping you DOT compliant in all states. And this is more than enough for any of your medium size trailers, whether you've got an enclosed trailer hauling some horses, or you've got a cargo carrier in the back, or you just have a utility trailer with a lot of lights on it so you can see and do your work at night.When you're finished using your harness, it stores inside the vehicle.


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