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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








Articles about Custom Fit Vehicle Wiring



Custom Fit Vehicle Wiring Questions and Answers

  • 4-Way to 7-Way Adapter Recommendation for a 2015 Equinox LTZ
  • We have exactly what you would need. For an adapter that would convert your 4-way to a 7-way for just controlling the taillight functions of the trailer you would want the part # 37185. The current 4-way you have on your 2015 Chevy Equinox will plug right in to the 4-way of this adapter and it will be ready to go. This comes with a bracket that will allow it to easily be mounted to your bumper. Check out the install video I attached for more info as well.
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  • 7-Way Relocation Kit Recommendation for a 2005 Chevy Silverado for Camper Install
  • If you are looking for a way to relocate the 7-way at the rear of your 2005 Chevy Silverado for the installation of a camper the part # 41157 that you referenced would be perfect for this as it will allow you to install a second 7-way in your bed up to 10 feet away from the 7-way at the rear of the truck. I attached an install video for this product for you to check out as well.
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  • Turn Signal On 2012 Kia Sorrento SX Hyperflashing After Installing Wiring Trailer Harness
  • Sounds like you are experiencing what is termed 'Hyperflashing'. My best recommendation is to remove the # C56146KIT and see if the problem still persists. If it does there is a problem in the vehicle wiring. If the problem goes away, then the converter is probably bad and the harness needs to be returned. If you do find you need to replace it I recommend the Tow Ready Wiring, part # 119147KIT. We have had good success with our customers that have used this kit. Please keep...
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  • Troubleshooting Trailer Wiring Not Functioning Properly on 2014 Mitsubishi Outlander
  • I checked with Tow Ready and they have confirmed that the Harness part # 118482 is a fit for your 2014 Mitsubishi Outlander. One thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would...
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  • Where Does the 20 Amp Fuse of the Curt Wiring Harness C56086 Install in a 2009 Honda Pilot
  • The 20 amp fuse of the Curt Wiring Harness part # C56086 that you referenced will need to go in the position 4 of the fuse panel like in the picture I attached. If there is a 20 amp fuse there already then you would not need to replace it. I attached an install video for a similar harness for you to check out as well. This may be the video you referred to.
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  • Dimensions of Bargman 5th Wheel and Gooseneck 90-Degree Pigtail Harness # 51-97-407
  • I pulled a sample of the Bargman 90-Degree Pigtail Harness # 51-97-407 from our warehouse so I could take the measurement you require. As shown in the linked photo the distance from the rear surface of the mounting flange to the 90-degree bend is 3-3/8-inches.
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  • LED Trailer Tail and Brake Lights Not Working when Connected to 2012 Nissan Frontier
  • The first thing I recommend checking is the tow package fuses and relays on your 2012 Nissan Frontier. There are some under the hood and some in the in-cab fuse panel. Use the owners manual to find their locations. If any relays are missing you could use Nissan relay kit # C57000. The LED lights on the trailer might not want to play nice with the particular tow package you have on your Frontier. This happens sometimes because LED lights draw much less power than regular incandescent...
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  • 4-Pole Trailer Wiring Harness Fit for 2015 Nissan NV200
  • My contact at TowReady, maker of the wiring harness # 118597 that you referenced, advised that this 4-pole kit should work on your 2015 Nissan NV200 although at this time the harness has not yet been formally tested on the 2015 model year vehicle. Since it does fit the 2014, which is the same generation, the odds are that it will fit and work just fine. You can easily check the fit of the harness in advance of purchasing it by taking a look at the harness' connectors shown in the linked...
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  • Trailer Wiring Harness Availability for 2016 Kia Sorento 4-Cylinder Turbo
  • The 2016 Kia Sorento is part of the latest (third) generation of this vehicle. The Curt wiring harness you referenced, custom-fit 4-pole harness # C56151, is a confirmed fit for the 2016 Sorento with the factory tow package and it fits either V6 or 4-cylinder versions with the factory tow package wiring. My contact at Curt verified this for me. If your Sorento does not have the factory tow package then instead you will need part # 56146KIT which is a hardwire installation. The kit includes...
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  • Trailer Wiring Recommendation for a 2015 Hyundai Santa Fe
  • The Tow Ready wiring harness part # 118269 has been confirmed to fit your 2015 Hyundai Santa Fe so it should work well for you. It installs just like the # C56151 that you referenced. I attached an install video for you to check out as well.
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  • Tips for Getting Connectors Apart For Installing # HM43385 Wiring Harness
  • The latches of the # HM43385 are reverse cam latches. Basically you will have to press down on the latch on the male side of the connector while pulling out at the same time. Sometimes connectors can be difficult to separate. I have found that if you press down on the release and then use a wide flat screwdriver between the two connectors to pry them apart that usually does the trick. A twisting motion with the screwdriver should do the trick.
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  • Will a 7- and 4-Way Trailer Connector Fit a 2015 Jeep Grand Cherokee
  • Yes, the 7- and 4-Way trailer connector # HM40975 should plug right up to the harness on your 2015 Jeep Grand Cherokee. If the Jeep did not come with a factory 7-Way then you might have to have the dealer program the computer to accept the 7-Way to get all the functions to work. So if you plug it in and not all the functions work, that would be why.
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  • Trailer Brakes Would Lock Up without Warning and then Stopped Working with 2000 Chevy Silverado 2500
  • To start, brake controllers can fail over time or if they get shorted out by faulty wiring so either scenario is possible. The wire that is broken off could be a factor, especially if it is the ground wire. It could also mean that there are other issues with the other wires or where they attach to the back of the connector so you will want to inspect the connector inside and out and make sure there is no corrosion, frayed wires, or wires that are touching. In-bed wiring is usually...
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  • How to Determine Where the Factory Transmission Cooler is on a 2007 Dodge Nitro 3.7 Liter
  • Stock transmission coolers usually will either be a part of the radiator or will have a stand alone core. One sure way to figure out where the stock cooler is to follow the lines that go to and from the transmission. Usually it is a stand alone if the vehicle has a towing package which is the case on many Ram trucks. On most other vehicles though it is integrated into the radiator.
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  • Troubleshooting Trailer Running Lights Not Functioning on a 2012 Nissan Frontier
  • It is possible that there is an in-cab relay that is missing on your Frontier, # 38666-1, but this is normally not the case on the Frontiers. It will be located next to the steering column under the dash. It would be a small blue relay. Yours may have blown. You can try swapping a known working relay in this spot to see if that fixes the running light circuit. It is also possible that you didn't install the jumper harness of the # 118525 behind the rear passenger side kick panel....
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  • Does the Tow Ready Wiring Harness # 118480 Have to Be Run to Vehicle Battery
  • Powered trailer wiring harnesses like the Tow Ready part # 118480 that you referenced have to have the battery wire run all the way to the positive post of the vehicle battery. The reason for this is so that the taillights of the trailer won't be putting any amperage draw on the delicate taillight wiring of the vehicle. All of the amperage would be drawn from the battery instead. If you were to power the unit from a 12 volt source like what you mentioned you would be defeating the circuit...
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  • Trailer Wiring Recommendation for a 2010 Kia Optima
  • Yes, I checked with Tow Ready and the Wiring Harness part # 118433 that you referenced has been confirmed to fit your 2010 Kia Optima so I would recommend it for you. I attached an install video that shows it being installed on a 2009, but the process will be the same for you.
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  • Towing a Trailer with Separate Amber Turn Signals with a 2010 Chevy Camaro
  • In order to install and use trailer wiring with your 2010 Chevy Camaro and tow a trailer that has amber turn signals separate from the brake lights you will need a couple of things. First, you will need a wiring harness for the Camaro, # 118486. This is a standard US style 4-Way flat. As such the brake lights and turn signals are combined on the same circuit. In order to get the amber turn signals to work on the trailer you would also need converter # 118158. This converter has a...
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  • Will Installing Tow Ready Wiring Harness # 118449 Cause Difficulty Starting 2015 Toyota Highlander
  • We have had no customers come back and say they had any difficulty getting their vehicle to start after installing the Tow Ready Wiring Harness part # 118449 that you referenced. You should be just fine to install this in your 2015 Toyota Highlander. I attached an install video for you to check out as well.
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  • Instructions for Installing T-One Vehicle Wiring Harness # 118551 on 2007 Ford Edge
  • Yes, the install of the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # 118551, on a 2007 Ford Edge will be the same as the 2008 model. I have attached our installation video as well as the written instructions for you. As for the install videos, our local customers that come in for installations allow us to record the process. We haven't had the opportunity to install a 4-Pole wiring harness on the 2007 model and therefore we do not have a video available.
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