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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

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 - 2014 Mazda CX-5

Okay, today on this 2014 Mazda CX5, we're going to install part number C56011 from Curt. This is a Curt T connector, vehicle-wiring harness with a 4 pole flat. Now we're going to install our wire harness. We need to get inside the vehicle so we will go ahead and open the back hatch and we'll go ahead and remove the floor coverings, as well as the threshold. It looks like there's two plastic fasteners. Okay, we'll go ahead and remove the rivet right here, this plastic rivet, so we will pull out the center and then the rest of it comes right out. It's just a steady pull straight up, will release it from those snaps. There it is. One is stuck so we'll just use a trim-panel tool to remove it. Out next step is to work with the side panel here, so we're going to undo this fastener and just pull it out a little bit so we'll get some extra working room to work our wires inside. It might be a good idea to go ahead and remove the phone core support inside as well.


Hopkins Endurance Fifth Wheel Wiring Harness Installation - 2003 Ford F-350

Today on our 2003 F350 Crew Cab Dually we'll be installing the Hopkins Endurance fifth wheel gooseneck 90 Degree Wiring Harness with 7-pull plug, part number 41157. To begin with we need to locate an area in the bed that we'll have to drill a hole so our new plug can be mounted to the side of the bed. We're going the go ahead and drill a hole here at the driver side rear on one of the ribs of the bed where it comes up a little bit to allow us a little extra room for the wiring in behind it. Before you drill any holes, make sure there's nothing behind it that could be damaged. First we need to use a hole saw to drill a 2-1/8 hole in our location that we've chosen in the bed. Now we'll go ahead and fish the end of the wiring harness with the two plugs through the hole and down to the ground. We'll keep the other end as we'll need to connect to the back of our new plug.


Fifth Wheel Wiring Harness Installation - 2007 Chevrolet Silverado

Today on our 2007 Chevrolet Silverado 2500 HD we'll be installing the Bargman Custom Fit Vehicle Wiring, part number 54701-003. Now this is a fifth neck goose wheel 90 degree adapter harness for a 7-pole on a GM. This will allow us to tap into the vehicle's factory 7-pole and remotely locate it into the bed of the truck for our gooseneck. To begin we'll need to locate a good position to mount our 7-pole in the bed of the truck. Now we've chosen the driver side here at the rear behind the rear wheel well. Now we've already gone ahead and removed our spare tire to make it a little more visible for us during this video. We'll now go ahead and drill a 1/4" pilot hole into the side of our bed.


Trailer Wiring Harness Installation - 2014 Honda Accord

Today on our 2014 Honda Accord 4-Door Sedan, we're going to be installing the Curt T-connector vehicle wiring harness with the 4-pole flat trailer connector, part number C56011. When you're ready to use your 4-flat wiring, you'll simply remove it from the storage area. We'll bring it out of the trunk making sure we stay away from the latch area as when the trunk is closed this could easily damage the wire. We'll push it in here on the weather stripping, so when we trunk is closed, it will push in and not damage the wire. We'll go ahead and close our trunk down. Here's what your 4-flat will look like when you're ready to use it. When you're done using your 4-flat wiring, you simply raise the trunk lid, take the 4-flat wiring, coil it up, and it will be stored down here next to the spare tire out of the way. Now, we'll keep our 4-flat wiring stored inside the trunk area to help protect it from the elements and give us years of service. Now, here's the tools that we're going to be using today to install our new Curt wiring harness.


Fifth Wheel Wiring Harness Installation - 2008 Ford F-450

Today on this 2008 Ford F-450 Super Duty, we're going to install part number 54701-003. First up, let's find a location for our connector. In this instance, we're actually going to install about right here. That way it's easy to get access to it from the tailgate section. To install it, we're going to have to drill a pilot hole first, then go back at it with a 2 inch hole saw. Now, take our wire harness and run it through the hole and let it fall out the bottom. Take our 7 pole connector and push it into place.


Trailer Wiring Harness Installation - 2008 Toyota RAV4

Today, in this 2008 Toyota RAV4, we're going to install part number C56165 from Curt. First thing you do is get inside the back of the vehicle, hold up the back door, and then we need to remove the floor coverings down to the well. Then we remove 2 flat panels on the bottom and 2 side panels on the interior. On the passenger side, we'll have to remove the jack as well. Then we'll go ahead and remove the threshold. We'll pull back the weather seal just a little bit and pry it up, releasing it from the clasp. Now pull it straight up and away. Now we need to loosen up the interior panels.


Trailer Wiring Harness Installation - 2011 Chevrolet Equinox

Today on this 2011 Chevrolet Equinox. We're going to install part number 118264 from Tow Ready. Okay, the wire install inside the car, so we need top open up the back hatch to get access to it. We'll also have to remove the floor covering, and this panel right here needs to be removed. Steady pressure pulling up shouldn't snap it. Set that to the side. Next we'll go ahead and remove this tie down points right here to give us some extra room.


Trailer Wiring Harness Installation - 2015 Subaru Outback Wagon

Today on our 2015 Subaru Outback Wagon, we're going to be installing the Curt T-connector vehicle wiring harness, with a full pull flat trailer connector, part number C56040. We're going to begin our installation by first raising the rear hatch of the vehicle. Next we're going to need to clean out any linings here that may be in the trunk, such as this rubber mat. We'll also set our cover here aside. Next, we're going to need to remove this rear cover here, then need to set the spare tire cover aside. We'll need to remove this trunk covering piece. Next we'll come up here to the back seats, and we'll fold each side down.


Articles about Custom Fit Vehicle Wiring



Custom Fit Vehicle Wiring Questions and Answers

  • 2014 Xterra Trailer Wiring Harness Recommendation
  • This wiring kit # C55441 is recommended by Curt for your 2014 Nissan Xterra and is designed to be used on vehicles that had the factory tow package in place from the factory, including any relays. What you can do is use a circuit tester like part # 3808 to test the port first to see if it is active when applying taillight functions. If the port has voltage there then you know you don't need any relays and the part # C55441 would be the correct wiring harness.
    view full answer...

  • Troubleshooting Curt Trailer Wiring Harness Install on a 2000 Nissan Xterra
  • The red wire of the Wiring Harness part # 56146KIT that you referenced should be run to the brake light circuit of your 2000 Nissan Xterra. If you are missing that connection I would recommend you verify that the other wires are securely connected to the correct circuits. Especially the black wire that needs to run to the positive terminal of your vehicle battery. If this connection isn't made, or the fuse isn't installed in the fuse holder the converter will not work. I attached an...
    view full answer...

  • Replacement Connector for a Pollak PA66-MD40
  • I spoke with my contact at Pollak and he stated that the Pollak Replacement 7-Pole, RV-Style Trailer Connector Socket, # PK11893-11933 is the correct replacement part for the Pollak PA66-MD40 that you have.
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  • Trailer Wiring Recommendation for a Ford E350
  • The Tow Ready Wiring harness part # 118260 that you referenced would be the correct wiring kit for your Ford E350 as long as it is a 2009-2012 model.
    view full answer...

  • Replacement 7-Way Recommendation for a 2007 Chrysler Pacifica
  • If your 2007 Chrysler Pacifica 4.0 Touring came with a factory 7-way yes, the Hopkins 7-Way part # HM42190 that you referenced would be the correct harness for your vehicle.
    view full answer...

  • Adding 7-Way to Install Brake Controller on a 2014 Ford F-150 with Factory 4-Way Trailer Connector
  • You will need to follow the 4-Way harness forward underneath your 2014 Ford F-150. It should plug into another harness that continues to the front of the vehicle. If you can find the harness the 4-Way plugs into then test the wiring in it using a circuit tester, such as # 3808. There should be a wire that has 12 volts of power all the time and another wire, likely blue, that is for output to the trailer brakes. You would use # 37185 to add a 7-Way. The black wire on it is for the...
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  • How to Figure Out the Wire Functions for Hopkins 7-Way Trailer Connector on 2004 Nissan Titan
  • Manufacturers can use any colors they want since there isn't really a standard for wire color and function. You will need to test each of the wires using a circuit tester such as # 3808 to determine the functions. Then you can attach them to the back of the 7-Way as shown in the picture I have provided. The colors you have provided are most similar to the picture but you will still want to test the wires to make sure they go in the right places.
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  • Troubleshooting Malfunctioning Taillight Converter on 1997 Toyota 4Runner
  • The problem you describe would usually make me suspect a poor ground connection on the trailer, but it seems you've eliminated that by trying other trailers on the vehicle. Just to be certain, check the spot on the vehicle where your converter grounds to the vehicle frame or chassis. Make sure this grounding point is secure and not corroded. To make absolutely sure, check the grounding points on the trailer as well (where the trailer connector grounds to the trailer tongue Next, you'll...
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  • Routing Power Wire for Trailer Wiring Harness on a 2014 Toyota Avalon
  • Trailer wiring harness # 118578 fits the Toyota Avalon and the RAV4 which is why you see a video for the RAV4. We haven't had the chance to install it on the Avalon. The portion of the video showing the actual routing of the power wire is not specific to that vehicle. You can definitely use it as a guide on your Avalon. I have also included a link to the right that includes tips on routing the power wire. Manufacturers of the wiring harnesses do not address how to get the power wire...
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  • Adding a 7-Way Trailer Connector to a 2013 Ford F-150 that Came with Factory 4-Way Flat
  • Your 2013 Ford F-150 must have come with the factory 4-Way connector. Since the harness for that connector uses a square plug and not the round plug, a simple plug and play 7-Way is not available. You will have to partially hardwire in a 7-Way using # 37185. I have included a link to a video that shows how this is done on a 2013 Ford F-150.
    view full answer...

  • Trailer Wiring Harness Recommendation for a 2013 Honda Pilot with Tow Package
  • From a functionality stand point the OEM wiring harness and the Tow Ready Wiring Harness part # 118265 will both do the exact same thing. We have never installed an OEM harness so I am not sure how difficult it would be to install, or if it would be any different than installing the part # 118265. This harness would be exactly what you would need, and since it costs much less than the OEM harness I would strongly recommend it for you.
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  • Troubleshooting Trailer Brake Lights Not Functioning after Wiring Harness Install 2011 Nissan Cube
  • The first thing you will want to do is test the 4-way of the # 118492 that you installed with a circuit tester like part # 3808. See the video I attached to see how this is done. This will tell you if the problem is on the vehicle side or trailer side of the wiring. I suspect the problem is on the trailer and it is that the grounds of the light assemblies aren't strong enough. Check to make sure the assemblies are grounded to a clean metal surface. Do the same for the main ground wire...
    view full answer...

  • 2014 Hyundai Santa Fe Trailer Wiring Recommendation
  • The only definitive way to tell if your 2014 Hyundai Santa Fe has the tow package or not would be to contact a Hyundai dealer and give them the VIN. If the vehicle came equipped with a hitch it most likely does have the tow package. Which if so, you would want the # 118269. However, the Curt harness part # C56184 that you referenced will work on your vehicle either way. So if you cannot definitively determine if your vehicle has the package or not this would be a safe bet. For a hitch...
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  • Where do the Relays Install with the Tow Ready Harness # 118265 on a 2014 Honda Pilot
  • The relays install on the wiring harness itself. They install on the black connnector block, see the picture I attached that points out the relays and the connector block where the relays go.
    view full answer...

  • How to Identify and Order a Replacement Trailer Connector
  • We can help you select a replacement trailer connector, and yes, you can submit a photo if you like. You can also use our Fit Guide to enter your vehicle information to see the trailer wiring items we offer. Since I do not know if you need vehicle-side or trailer-side connectors, or what type of connector, I have linked our main page for wiring where you can enter your vehicle information (if you need a vehicle harness) or select the type of trailer wiring you need. Please feel...
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  • Troubleshooting the Curt Wiring Harness part # C55510 Not Functioning When Ground is Attached
  • The first thing you will want to do is test the 4-way of the # C55510 that you installed with a circuit tester like part # 3808. See the video I attached to see how this is done. This will tell you if the problem is on the vehicle side or trailer side of the wiring. You will want to reinstall the harness per the installation instructions and test the 4-way with the key on. I would make sure you have the ground circuit attached to a clean metal surface that touches the vehicle frame....
    view full answer...

  • How to Find the Reverse Light Circuit on a Vehicle
  • That information I do not have, but I can help you determine which wire it is. You will need to use a circuit tester like our part # 3808 to test all of the wires going to the reverse lights. Which ever one has voltage only when the reverse lights are on is the one you are looking for.
    view full answer...

  • Installation Instructions for the Tow Ready Wiring Harness part # 119178KIT
  • I attached a link to the right that has the installation instructions for the Tow Ready Wiring Harness part # 119178KIT you referenced. I also attached an install video that shows this harness being installed on a similar Saturn as yours. Your local hardware store should be able to set you up with a self-tapping screw to use for the ground wire as well.
    view full answer...

  • Installation Instructions for 4 Pole Harness Kit # 119179KIT on 2014 Subaru Impreza
  • I have attached the installation instructions for the Upgraded Circuit Protected Modulite with 4 Pole Harness and Hardwire Kit, # 119179KIT. You will see the link off to the right. As for an installation video, I have attached one that will go through the basic steps on how to test wires, where to connect the wires, and routing. Please keep in mind that the installation for the 2014 Subaru Impreza won't be exactly like the one on the video since that was on a different vehicle but this...
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  • Comparing Curt T-Connector Wiring Harness and Tow Ready T-One Wiring Harness for 2011 Wrangler
  • The only difference between the Curt T-Connector Wiring Harness, # C55124, and the Tow Ready T-One Vehicle Wiring Harness, # 118416, is that they are made by two different manufacturers. They are essentially the same exact wiring harness coming from two different companies. Both Tow Ready and Curt are reputable companies so you will not be sacrificing quality with either harness. When deciding which harness to purchase, I would go with the least expensive option to save money. I have...
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