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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

  • Troubleshooting Trailer Taillights that Don't Function Consistently
  • This sounds like a ground issue. 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 another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare...
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  • Testing Brake Controller that Only Works with Manual Override Lever
  • First thing to do is look for and clean any corrosion on either your vehicle's 7-way wiring and the trailers connector. Testing the brake controller is fairly easy. You will need to be able to access the brake controller wiring which should be behind the dash area near the controller's location. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like the Quickee Tester, part # 3808, you...
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  • Trailer Hitch and Wiring Recommendation for a 2015 Kia Sorento 4 Cylinder
  • The trailer wiring kit part # 56146KIT is the correct wiring kit for your 2015 Kia Sorento with a 4 cylinder engine. The 6 cylinder engine models with the tow package can use the custom fit kit part # C56151 instead. The correct hitch would be the Curt Hitch part # C13152. I attached an install video for you to check out as well. If you plan on doing some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2...
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  • Trailer Wiring and Brake Controller Recommendation for a 2015 Honda Pilot
  • The T-One Vehicle Wiring Harness # 118265 comes with everything needed to install a 7-Way on a 2015 Honda Pilot, but it does not come with any brake controller ports. To install an aftermarket brake controller in your vehicle it will have to have the port already or have one from a Honda dealer installed. The correct harness to use once you have the port would be part # 3070-P. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best...
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  • Constant Power on 4-Way After Installing Trailer Wiring Harness on a 2013 Nissan Juke
  • It might be the tester. If the tester uses LED lights and it is a powered harness there can be some bleed off from the harness. This is normal and since LED lights require such little power draw they would light up a little. If you are using Curt wiring harness # C56124 on your 2013 Nissan Juke, it doesn't have a power wire. Green is right turn, yellow is left turn, brown is running lights, red is brake lights, and white is ground. Constant power usually indicates a short. Check...
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  • Trailer Wiring Harness for a 2012 Lexus RX 350
  • You are going to need a trailer wiring harness that requires a separate connection to the vehicle battery, # 118478. The purpose of the power wire is to actually power the trailer lights. This adds another layer of circuit protection between the trailer wiring and vehicle wiring. The wiring on the vehicle is not designed for the extra load of the trailer lights and could damage the vehicle wiring; something you do not want to happen. Routing the power wire is easy, it just takes time....
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  • No Running Lights After Installing Trailer Wiring Harness on a 2014 Honda CR-V
  • It could possibly be the ground wire on the wiring harness on your 2014 Honda CR-V. Make sure it is attached to a clean bare metal non-painted or coated surface. It could also be a fuse. The harness comes with a small 7.5 amp fuse and if that is not installed or is blown then that could be the problem as well. To test to see if the harness is the problem use a circuit tester such as # 3808. Test the wires going into the converter box from the vehicle. When the vehicle running lights...
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  • Trailer Wiring Recommendations for Ford Super Duty Truck Late Model
  • If your Ford trucks have a the 7-way round receptacle wiring that the # 20119 is designed to fit already the # 20119 would work great for you. If you do not have that harness then this wouldn't be the correct harness to get. If you don't have any trailer wiring you would need to start with a 4-way like part # 18252. To convert a 7-way you would only need part # 37185. If you plan to install a brake controller though you would need the part # ETBC7 instead of the # 37185. For a brake...
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  • Troubleshooting Trailer Passenger Side Stop Turn Circuit Not Functioning
  • First thing I would do is ask your buddy what all he messed with, if you can get him to undo the damage he did to your trailer you will be in better shape. It sounds like the original problem you had was just a bad ground on the passenger stop/tail light. Typically light assemblies ground through their mounting hardware so ensuring this light is attached to a clean metal surface would be a great place to start and would most likely fix the problem. I attached a trailer wiring diagram...
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  • Adding a 7-Way Trailer Connector to a 2014 Chevy Traverse LT
  • Tow Ready wiring harness # 118271 is designed for 2014 Chevy Traverse models that came with a factory tow package. It is possible that your model does not have the factory tow package. But, it is also possible that the connector you need is tucked up where you can't easily see it or reach it. You would need to fish around for it up above that panel in the location where it is supposed to be. If you do not have the factory tow package (have the dealer run the VIN if you are not sure)...
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  • 7-Way and 4-Way Combo Recommendation for a 1999 Ford F-250 with 4-Way
  • It sounds like your 1999 Ford F-250 has a factory 4-way and you are looking to upgrade it to a 7-way plus a 4-way and you want to do this as simply as possible. The easiest way to do this would be to get the # 118243 as well as the # HM40975, use the harness and fuses relays from the # 118243, and then use the connector of the # HM40975.
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  • 4-Way Recommendation for Powering Camper Shell Taillights on 2015 Ford F250
  • What you need is the Curt T-Connector Vehicle Wiring Harness # C55384. This will plug inline with the 7-way you have at the rear of your 2015 Ford F250 and will give you an additional 4-way that you can then use for your camper.
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  • Trailer Brakes Stopped Working on Gooseneck Trailer After Installing a 5-Way Connector
  • First, on the truck side 7-Way, check the pin in the 5 oclock position using a circuit tester such as # 3808 while someone sits in the truck and applies the manual override on full on the brake controller. If you are not getting voltage at that pin, which is the brake output pin, then that could be the problem. Most 5-Ways are set up to power an electric reverse lockout on the trailer coupler. So on the vehicle side that would correlate to the reverse light circuit which is the center...
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  • How to Find Stop Light Circuit in a 2014 Mercedes Sprinter
  • To find the cold side of the stop light circuit on a vehicle like your 2014 2014 Mercedes Sprinter you need to use a circuit tester like the part # 3808 to test all of the wires going to the brake switch. You will want to find the circuit that sees 12 volts when the brakes are applied and none when the brakes are released. It SHOULD be a pink wire with a green stripe. It sounds like you may be installing a brake controller so I attached a link to a page on how to install brake controllers...
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  • No Power on Right Turn/Brake Light Circuit when Stepping On Brakes on 2004 GMC Sierra
  • If there is no voltage on the associated fuse then it could be a problem with the power distribution box on your truck. A GM tech would have to look at that. There may also be a relay that needs to be examined. Use the owners manual to find relay locations. If the turn signal is working but the brake light is not then it could be a blown stop light or CHMSL fuse but that should also affect the yellow, left turn/brake light wire.
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  • Recommendation for Towing a Trailer with 4-Way with a 2013 Toyota Tundra with 7-Way
  • For your 2013 Toyota Tundra I would recommend you replace your current 7-way with a part # HM11143395. This will plug into the factory wiring of your truck and will give you both a 7-way and a 4-way trailer wiring connector at the rear of your vehicle so that you could tow a trailer with either style connector. I attached an install video for this product for you to check out as well.
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  • Right Brake Light on 4-Pole Trailer Connector Not Working on 2004 GMC Sierra
  • If your 2004 GMC Sierra uses a 4-pole flat trailer connector like the Tow Ready # 118384 that you referenced the right turn and right brake light signals both will be carried on the green wire. Please refer to the linked photo. The most common cause for one light function (the right turn light) to work while another carried on the same wire (the right brake light) does NOT work is a bad ground connection. Turn signals do not pull as much current as a brake light signal, since turn signals...
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  • 4-Way Trailer Wiring Harness Recommendation For 2015 Honda Pilot
  • We have just the wiring harness that will work for your 2015 Honda Pilot. I recommend the Curt T-Connector Vehicle Wiring Harness, part # C56170. This harness simply plugs into the connection point behind rear bumper, and the converter connects in the rear cargo area. When working with electrical connectors I recommend using dielectric grease like part # 11755. This keeps dirt and moisture out of the electrical connections and helps prevent corrosion. If you want to secure the...
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  • How to Convert a 4-Way on a 2006 Ford Expedition to a 7-Way to Install Brake Controller
  • You will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. This will convert your 4-way to a 7-way and comes with everything needed to install a brake controller. I attached installation instructions and an install video for this product as well. For a brake controller I would recommend the Prodigy Brake Controller part # 90185 that you already have. This is our best selling brake controller because of how well it works and how easy it is to setup.
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  • Troubleshooting Trailer Lights that Don't Work All the Time
  • This sounds like a ground issue. 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 another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare...
    view full answer...











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