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Trailer Wiring

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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.

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




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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 - 2010 Mercury Milan

Today on this 2010 Mercury Milan, we're going to install part number 118502 from Tow Ready. This is a T-One Vehicle Wiring Harness with a 4-Pole Flat Trailer Connector. Now when we need to use our wire harness, it's pretty easy, we'll go ahead and pull out just a little bit and shut the door on it. The door seal is thick enough where it won't hurt the wire. Now don't put it right here, otherwise you'll smash the wire. We'll go ahead and shut the hatch and then we can go ahead and pull out what we need out to our trailer.


Trailer Wiring Harness Installation - 2001 Ford Windstar

Today on this 2001 Ford Windstar, were going to install part number 118366. This is the T-One Vehicle Wiring Harness with the 4-Pole Flat Trailer Connector. Now our connection points for wire harness are behind the taillights, so we need to open the tailgate and remove the taillights. Use a Phillips screwdriver to remove these two screws. Well go ahead and remove our light. It looks like somebodys been in here once already because it came off pretty easy.


Trailer Wiring Harness Installation - 2007 Nissan Murano

Today on this 2007 Nissan Murano, we're going to install part number C56105 from Curt. This is a Curt T-Connector Vehicle Wiring Harness with a 4-Pole Flat. Let's open up the back hatch, and we'll remove all the floor coverings, getting down to the spare tire. We'll take this panel, raises up, and remove this tray. Get this cover for the spare tire out of our way, and our side panels here. They'll be one on each side of the car. Now these pockets right here, we have to loosen up as well. There's two bolts on the inside, and a 10 millimeter socket will get them loose.


Trailer Wiring Harness Installation - 2008 Chrysler Sebring

Today on our 2008 Chrysler Sebring we will be installing the Tow Ready T-One Connector, part number 118444. To begin with you'll need to raise the trunk lid up. Next you will need to locate the two plastic nuts that are on the backside of each of the light assemblies. On this particular vehicle, since it's a convertible, we we're able to just slip our hand in behind the inner lining of the trunk and get both of the nuts removed from the rear of the light assembly. You'll need to repeat this procedure for both the driver and the passenger side. Once you have the two plastic nuts removed from the rear of the light assembly you'll gently pull the light assembly out, being sure not to break the clip off that slides into the body. Once that is out we will need to disconnect the two wire connections on the back.


Trailer Wiring Harness Installation - 2014 Toyota Prius V

Today on this 2014 Toyota Prius V, we are going to install part number 118610, from Tow Ready. This is a T-One vehicle wire harness with a 4 pole flat trailer connector. To start off we need to open the back hatch of the vehicle.We will go ahead and cover the layout of the wire harness. The T-connector with the yellow wire is going to install on the wire harness roughly in this area here, behind this panel. Likewise on the passenger side, the T-connector with the green wire we will install back in there. Our white wire with the ring terminal will be our ground.


Articles about Custom Fit Vehicle Wiring



Custom Fit Vehicle Wiring Questions and Answers

  • 2014 Nissan Frontier Trailer Hitch Wiring Harness Recommendation
  • What you will need is the T-One Vehicle Wiring Harness # 118525 if you don't have the tow package, or the # C55441 if you do have the tow package. Basically these two harnesses are the same except the # 118525 includes the relays and harnesses to activate the plug in harness that is on your 2014 Nissan Frontier. If you are unsure if you would need the relays of the # 118525 you can test the connector in the picture I attached that is under the rear of your vehicle for voltage when...
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  • Parts Needed to Add a 7-way to a 2010 Honda CR-V
  • For your 2010 Honda CR-V you will first need to start with a 4-way if you don't have one since there are no 7-way options for your vehicle. For that you will want the # 118427 if needed. Now to convert it to a 7-way all you will need is the # 37185. This will plug right into the 4-way of your CR-V and will provide you with a 4-way and a 7-way. If you permanently mount this part it would be just like having a 7-way installed.
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  • Towing Capacity of 2001 Chevy Silverado for Towing 9000lb Travel Trailer
  • Finding the actual towing capacity of a truck sight unseen can be difficult. The towing capacity can vary wildly from model to model. The engine size, transmission and gear ratio of the rear end will all have an influence on the towing capacity of the vehicle. The most definitive way of determining the towing capacity of your truck would be to check the identification plate installed in the door jamb of the driver's door. The plate will list the GCWR, or Gross Combined Weight Rating,...
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  • Connecting Power Wire of # 118526 Taillight Converter to 12-volt Socket of 2015 Kia Sportage
  • One of the primary purposes of drawing the power for the taillights directly from the battery is to isolate the wiring system of the vehicle from the trailer wiring. This way, the vehicle wiring will be protected from any short circuits that might occur in the trailer wiring. Installing the wiring harness in the manner you describe would also void your warranty coverage. I can't recommend you install the Tow Ready # 118526 in any other way than what the manufacturer recommends. You can...
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  • Subwoofer and HondaVac Not Functioning after Trailer Wiring Harness Install on a 2014 Honda Odyssey
  • Either the sub and Hondavac of your 2014 Honda Odyssey got unplugged during the install and weren't plugged back in properly, or there was a short on the trailer harness that blew the fuses of the two since they are close to where the trailer harness plugs in. Most likely the problem is fuse related though. Check the fuse panel near the harness in the back of the vehicle and then also check the other fuse panels of the vehicle. If this happened after you towed your trailer then most...
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  • Wiring Harness Recommendation For 2014 Jeep Grand Cherokee Limited
  • We do have a wiring harness that will work for your 2014 Jeep Grand Cherokee. The factory wiring harness will be terminated behind the rear bumper and may have a plug or cap. You can simply uncap the harness and plug an adapter like the Pollak 7- and 4-Pole Trailer Connector, part # HM40975. This will give you a 7-way and a 4-way connector at the rear of your Grand Cherokee. If you do not have enough wire harness length with the Jeep connector you may want to take a look at the Tow...
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  • Troubleshooting Trailer Running Lights Not Functioning on a 2014 Nissan Frontier
  • It sounds like the problem might be the wiring of your trailer, but to test this first you want to use a circuit tester like part # 3808 to test the pins of the 4-way on the # 118525 for voltage when the correct taillight function is applied. I attached a video that shows exactly how to do this. If the voltage is in all the correct places the problem is the trailer. If not, then it's the wiring of your 2014 Nissan Frontier. If it's the trailer you will want to inspect the connector first...
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  • Where is the Power Wire Connector for the Wiring Harness # 118367 on a 2000 Toyota Tundra
  • The wire should be there on your 2000 Toyota Tundra, you will need to slide the battery over and look between the fender and the battery tray. I attached a picture of where it will be located to the right. It may have slipped down further than what is in the picture so you might need to look past any wiring harnesses there to find it. That we are aware of every model of the 2000 Toyota Tundra should have this connector. It should be just a matter of looking hard enough to find it as...
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  • Recommended Components Needed For Towing With 2015 Chevrolet Tahoe With Police Package
  • From my research on your 2015 Chevrolet Tahoe with the Police Package, I found that the trailer hitch receiver was a standard item. We do not list any rear mounted trailer hitches for the 2015 Tahoe. You may be interested in the 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 also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with clip, and a storage bag. I have attached a product...
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  • 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...
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  • How to Install a 7-Way and a P3 Brake Controller in a 2007 Ford Expedition
  • Actually instead of the # HM40975 you would want the # 37185. This will allow you to plug your current 4-way directly into it and then attach your brake controller wire to the blue wire. Check out the install video I attached for more info. This would go great with your P3 Brake Controller # 90195 that would install with the # 3035-P.
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  • Where is the Wiring Harness Connector for Installing Trailer Wiring in a 2007 Subaru Legacy
  • On the 2007 Legacy Outback Wagon the wiring harness used to install the # 118461 is sometimes hard to find. For some reason it gets routed differently and can be in the spare tire well, up along the back near the bottom of the rear seat or under the rear panel nearest the hatch. I spoke to our installation technician and he said that he removes all of the panels and follows the vehicle wiring harness along until he comes across the connector. It is there you just have to search for it. Our...
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  • 2010 Nissan Frontier King Cab 7-Way Trailer Connector Not Functioning Properly
  • What it sounds like to me is the relay could be blown. Since you know where the relays are located, check your relays by replacing with a new relay. This is the best way to tell if you have a bad relay somewhere. I would still recommend looking at your owners manual to locate other potential relays and fuses related to the tow package wiring. Since your 7-way vehicle end connector is cracked, you could always replace it with # N40975. It also includes the 3 relays required to activate...
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  • Trailer Right Turn and Brake Light Circuit Stopped Working on a 2004 Nissan Armada
  • On some Nissan vehicles like your 2004 Armada there are also relays and/or fuses inside the in-cab fuse panel so you will want to check those as well. Use the vehicle owners manual to find all locations of the fuses and relays related to the tow package wiring. I agree that it does sound like a fuse or relay. Checking fuses is easy but relays are trickier. Basically the easiest way to test a relay is to use a known good relay in place of a potential bad one. The turn signal functions...
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  • 1999 Ford Explorer Eddie Bauer Trailer Connector
  • In my research, I wasn't able to find out definitively if all the Eddie Bauer Explorers included a trailer connector. Some 1999 models were equipped with a towing package which included the 4-pole trailer connector. What I read seemed to indicate that if the vehicle was equipped with the factory trailer hitch, it'll have the factory wiring. Determining how your particular vehicle is equipped would be very simple. Look behind the rear bumper on the passenger side of the vehicle for a...
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  • Troubleshooting Utility Trailer Taillights Stop/Turn Signals Not Functioning
  • It sounds like the problem is the trailer's wiring. I know it may seem like it is working correctly since you powered it with a 12 volt battery and it appeared to work like it should, but what is most likely the problem is either from having a weak ground on your trailer wiring or the trailer lights are drawing more power than the trailer wiring is rated for. 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...
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  • Trailer Wiring Harness for a 2003 Toyota Tacoma for a Bully Fire Strip LED Light
  • Yes! You can use the Bully Fire Strip LED Light # BLS-1101 with trailer wiring harness # 118379 on your 2003 Toyota Tacoma. Like you said, this Fire Strip does not have a reverse light feature. It does plug into a 4-Way flat trailer connector which is what the wiring harness # 118379 has. So you will be good to go with these two parts.
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  • Best Way to Check if a 2011 Ford Escape Limited Came with a Factory Towing Package
  • The way to check if your 2011 Ford Escape came equipped with the factory tow package is call your local dealership and provide them the VIN number. The relays # TR38665 should work fine in conjunction with the Draw-Tite wiring harness, part # 118251 and would complete the tow package wiring on your Escape. I always recommend using dielectric grease such as # 11755 as it combats corrosion from water damage. I have included a couple installation videos and an FAQ for you too.
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  • Where is the Ground Wire for the Tail Lights on a 2004 Chevy Colorado
  • If you look at were the white wire is on T-harness # C55510, that is the ground on it. So the corresponding pin and the wire connected to it would be the ground on the vehicle tail light wiring. It looks like you would have to pull back the protective covering on the vehicle side harness (where the Curt harness plugs in) to even see the wires. If the problem is happening with and without the T-harness installed then that could indicate a bent or broken pin in the vehicle connectors.
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  • 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.
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