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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 - 2014 Ford Focus

Today on our 2014 Ford Focus Five Door we're going to be installing the Tow Ready T1 Vehicle Wiring Harness, part number 118549. We're going to begin by raising the rear hatch of the vehicle. Now that we have our rear hatch open go ahead and set this trunk cover aside for now. Go ahead and set the spare tire out as well. The reason why I took all that out is to gain access to this grommet that we'll be using in a little bit. Now that we have the trunk area cleared out next we're going to need to remove this panel right here to gain access to the nuts that are behind the taillight assembly. Simply push in and pull outward and set it aside. Now with our panel removed let's go ahead and point out the two plastic nuts that we'll need to remove.

Trailer Wiring Harness Installation - 2003 Honda Pilot

Today on our 2003 Honda Pilot we're going to be installing they Tow Ready T1 vehicle wiring harness with a 4-pole flat trailer connector, part number 118336. We'll go ahead and begin our installation by raising the rear hatch of the vehicle. Next we'll need to lift the rear cover here up and out of the way. Go ahead and just lift it up and then just clips out. Go ahead and set that out of the way for now. We'll then need to remove this whole rear threshold piece.

Fifth Wheel and Gooseneck Wiring Harness Installation - 2001 GMC Sierra

Today on our 2001 GMC Sierra, we'll be installing the Pollack 5th Wheel and Gooseneck Trailer Connector, part number PK11893-11932. Now to begin our install, we'll first go ahead and find a location to mount the new 7-pole connector and drill out our holes. In our pickup bed on the driver's side just behind the rear wheel well is a good location. Using a 2-inch hole saw bit, we'll go ahead and drill out our hole. Now in order to get our wiring harness fed from underneath and up through our hole, we'll need to remove the two fasteners that secure the mudguard here behind the wheel well. There's one just on the inside of the wheel well lip and one underneath the tail light area. Once we have the fasteners out, we can go ahead and pull the guard down. Now that we have the wire fed into position, we'll move back to the pickup bed where we'll install the wires into the back of the connector. Now when installing our wires, each connector is faintly marked with a number.

Pollak Trailer Connector Socket Installation - 2014 Chevrolet Silverado

Today on our 2014 Chevrolet Silverado 1500 Double Cab, we're going to install part number HM40975. This is a Pollak 7 and 4-Pole Trailer Connector Socket. We're going to remove the blank that holds the wire harness in place. Now, I already have it loosened up. You can pull it out. This is our new part here.

Trailer Wiring Harness Installation - 2000 Mercury Grand Marquis

Today on our 2000 Mercury Grand Marquis we'll be installing the Tow Ready Circuit Protected Module Light with Four-Pole Harness, part number 119179KIT. To begin our install we'll first need to hook up our new module light and wiring harness. To do that we'll need to locate the manufacturer's wiring that runs to the rear taillights. To do this we'll go ahead and remove the four push pin fasteners securing the rear threshold. Next we'll go ahead and remove the rear threshold and sit it aside. Now by the removing the plastic hold down fastener for the carpeting we can peel back the carpeting along the threshold and behind the driver's side taillight assembly. Here we'll locate the wiring that runs to both taillights. To access the wiring we're going to go ahead and use our utility knife to cut back the electrical tape and cover and remove it so that we can use our test light to probe each wire to locate the running light, turn signal and brake circuits. Now for this application it's a combined setup so the turn signals will also act as the brake light signals.

Trailer Wiring Harness Installation - 2012 Volkswagen Jetta SportWagen

Today on our 2012 Volkswagen Jetta Sport Wagon we'll be installing the Tow Ready Custom Fit Vehicle Wiring Harness with Four-Pole Connector, part number 119179KIT. To begin our install we'll first need to remove the spare tire cover and lower storage cover. Then we're going to remove the cover panel behind the passenger side taillight assembly. Using a flat blade screwdriver we'll get in behind the cut out panel and go ahead and sat it aside. Then on the driver's side we'll go ahead and fold down the access compartment by unlatching the two twist knobs and then pulling back on the cut out of the carpeting to expose the wiring behind the driver's side taillight assembly. Now that we've exposed the wiring behind both taillight assemblies we'll need to remove the rear threshold. To do this we'll remove the two fasteners that secure it. Once we unscrew them we'll set them aside we can gently pull up on the rear threshold releasing the fasteners underneath. Now with that done we'll need to identify the running, turn signal and brake lights.

Articles about Custom Fit Vehicle Wiring

Custom Fit Vehicle Wiring Questions and Answers

  • Trailer Wiring Harness for a 1957 Chevy Pickup Truck
  • The first thing to determine is why the other converters stopped working so soon. Modern converters are designed to work on 12 volt systems with a negative ground. Many older vehicles used a 6 volt system and/or positive ground electrical system. Make sure that the 1957 Chevy Pickup truck is a 12 volt, negative ground system. It is also possible that the trailer has enough lights to overdraw the converters. Converters have amperage ratings and if exceeded that can cause them to blow....
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  • Current Capacity of Curt T-Connector Vehicle Wiring Harness # C56217 in 2015 Toyota Highlander
  • The Curt T-Connector Vehicle Wiring Harness # C56217 that you referenced is indeed a correct fit for your 2015 Toyota Highlander. Please note that the 10-amp ATC fuse included in the kit is not intended for installation in the vehicle's fuse panel; this fuse is to be installed in the included red fuse holder that is wired to the converter box. I don't think you need to worry too much about blowing the fuse. This particular harness has a substantial output current capacity - 3 amps...
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  • Why Do Some Vehicles Need a Converter to Add Trailer Wiring Like a 2001 Chrysler Town & Country
  • Converters are required when a vehicle has what is called a 3-wire or separate lighting system. These systems will have turn signal circuits that are separate from the brake light circuits. Trailers use a 2-wire or combined system meaning the brake lights and turn signals are on the same circuit. A converter is needed to take the separate signals from the vehicle and combine them so that the trailer lights operating on a combined system will work properly. Wires and fuses connected...
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  • Replacement 7-Way Connector For 2008 Ford F-250 With Towing Package
  • We do offer replacement connectors that will work with your OEM wiring harness on your 2008 Ford F-250. If you just need the replacement 7-pole connector, I recommend part # PK11893. This is an exact replacement for the OEM connector on your truck. If you find the vehicle side of the harness was damages, I recommend part # C55242. This plugs directly into OEM tow package wiring harness and requires no cutting or splicing of wires. To get a 6-pole connector on the rear of your...
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  • How To Install a Trailer Brake Controller in a 2004 Toyota Land Cruiser
  • To activate the brakes of your trailer while towing your 2004 Land Cruiser you will need two additional components. You will need a brake controller and a brake controller install harness. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to setup. Now to wire this brake controller your vehicle with a factory 7-way you will need the install harness part #...
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  • Trailer Wiring Recommendation for a 2014 Jeep Wrangler Unlimited
  • Yes, the Curt T-Connector Vehicle Wiring Harness # C55124 that you referenced is confirmed to fit your 2015 Jeep Wrangler Unlimited. I attached a review video for you to check out as well.
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  • Troubleshooting Trailer Wiring Converter Box that One Taillight Stays on After Brakes are Released
  • Sounds like you have narrowed down the problem to possibly being on the converter you have installed on your 2011 Toyota FJ Cruiser, part # 118405. When converters go bad they can do all sorts of weird things, what you described sounds like it could be a bad converter. What you will want to do is test the wires going into the box of the converter box for voltage with a circuit tester like the # 3808 to see if there is voltage going into the box when the taillight functions of your...
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  • Wiring Adapter For 7-Way connector On 2009 Mercedes Benz And 4-Way Connector On Trailer
  • For your 2009 Mercedes Benz ML the adapter I recommend is the Tow Ready 7-Way to 5-Way and 4-Way Trailer Adapter, part # TR20141. This adapter is designed for vehicles with LED lights. This will allow you to be able to power the lights on your trailer without having to replace the 7-way connector on your vehicle. In the future if you need to tow a trailer with a 7-way connector, you can simply remove this adapter and you are ready to go.
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  • Running Light Circuit Not Active on Trailer Wiring on a 2014 Nissan Xterra
  • It sounds like your 2014 Nissan Xterra is missing one relay that is traditionally found under the dash to the left of the steering column. There is a socket there to plug in the relay that will activate the tow package tail lights. You will need the part # 38666-1 which is the additional relay to go along with the # C55441 and you would have a fully functional 4-way on your 2014 Nissan Xterra
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  • Where to Find the Connector on a 2000 Honda Accord to Install Wiring Harness # 118336
  • To find the trailer wiring connection point on your 2000 Honda Accord to install the Trailer Wiring Harness part # 118336 you will need to Unscrew the knob securing the access panel on the driver’s side of the vehicle’s trunk. Remove the access panel to expose the vehicle’s wiring harness and connector.
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  • Can the Blue Locking Piece of a Trailer 7-Way be Removed from the Connector Once its Locked
  • The blue locking piece you referenced unfortunately is not easily removed. In fact, there's basically no way to get it out without breaking it. The installers here have tried several times to get it out and always end up breaking it. The easiest solution I have for you would be to cut the wires behind the connector leaving enough room to reconnect them so that you can get the outlet and wires on the right side of your truck bed and then reconnect them once you get the 7-way mounted in...
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  • Troubleshooting Truck Blinkers that Only Blink Once when Trailer is Connected
  • If I am understanding you correctly it sounds like when your trailer is connected to your truck and you activate either blinker your truck's blinker only blinks once then stops. This would lead me to believe that your blinker circuit is getting overdrawn by the trailer circuits which is preventing them from working. What I would recommend you do is replace your current trailer blinkers with LED blinkers as they will draw considerably less power than incandescent bulbs which should prevent...
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  • Trailer Wiring Harness Recommendation for a 2015 Kia Sorento
  • Most likely the Trailer Wiring harness part # 118269 will work on your 2015 Kia Sorento, but it hasn't been officially released as a confirmed fit for the 2015 models. With that being said, the Curt version of this harness, part # C56151, has been confirmed to fit the 2015 model so I can almost guarantee both harnesses would work for your vehicle. Since the Curt has been confirmed to fit your vehicle it would be the one I would recommend for you.
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  • Compatibility of Tow Ready T-One Wiring Harness # 118554 with 2014 Infiniti QX60
  • The Tow Ready T-One Wiring Harness you referenced, part # 118554, is a correct plug-and-play fit for various model years of the Jeep Liberty and Dodge Nitro. It is not a confirmed fit for your 2014 Infiniti QX60. We do not yet have any confirmed trailer wiring harness fits for your QX60. Newer vehicles can take time to be evaluated and tested by the harness manufacturers like Tow Ready and Curt. It may be necessary in the short term to obtain a harness from your Infiniti dealership....
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  • Installing 7-Way Trailer Connector on 1998 Dodge Dakota
  • It looks like you're wanting to install a 7-way on your vehicle, is that correct? If your truck was equipped with the factory 7-way, and you're wanting to replace it, you'd just unplug the harness from the rear of the connector, and replace it with a 7-way like part # HM40975. If your Dakota doesn't have a trailer connector, you'd first install a 4-pole like part # 118329. How you'd proceed from here will depend on how your trailer's equipped. If your trailer doesn't have electric brakes,...
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  • Effects of a Vehicle Wiring Kit and 2008 Dodge Grand Caravans Battery When Idle for 6 Months
  • The ModuLite in the custom fit vehicle wiring kit # 118552 is designed to draw it's power from the battery. As a result, it bypasses the electrical routes that are used by the wiring harness. I spoke with our technical representative at Tow Ready about your vehicle sitting for 6 months. As long as you have a good battery and the wiring is properly sealed everything should be just fine. It may draw a little power from the battery but the ModuLite does a good job protecting your vehicles...
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  • Cant Find T-One Connector Plug on my 2003 Chevrolet Venture to Install Trailer Wiring 118355
  • Since the part # 118355 can fit a few different vehicles with differing setups you will need to check a few places to find the connector you need. First thing I would recommend is checking out the install video I attached to the right that shows this harness being installed on a 2003 Chevy Venture just like yours. Also, some vehicles will only have one connector. Some of the vehicle options have another connector plugged in series with the taillight connector plug, and the second plug...
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  • Trailer Lights Work for a While then Stop Using Trailer Wiring Harness on a 2012 Jeep Patriot
  • There are a couple of things that could be causing the problem you are having with trailer wiring on your 2012 Jeep Patriot. First, if the trailer has a lot of lights then it is possible that they draw more power than the harness and/or the vehicle is rated for. A dirty or corroded trailer connector could be causing a short and that could cause this problem as well. If the right light is the only one that comes on, but it stays on, that to me sounds like a short and/or possible ground...
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  • Adding a 7-Way Trailer Connector to a 2006 Saturn Vue
  • In order to add a 7-Way trailer connector your Saturn Vue you will first have to install a 4-Way using # 118418. Then to add a 7-Way you have 2 options. If all you want is for the lights to work on the trailer when you tow it with the Vue then you would need # 37185. You would ground the white wire and the other wires can be capped off and stowed out of the way. If you want all the functions of the 7-Way to work you would install the 4-Way but use # ETBC7 to add the 7-Way. If the trailer...
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  • Brake Controller Installation on 2010 Ford Escape
  • It sounds like you have a pretty good handle on what you need. I'd recommend you begin by choosing a brake controller. I'd recommend a proportional controller like the Tekonsha Prodigy P2, part # 90885. A proportional controller has internal sensors that can determine how quickly the tow vehicle is braking, and then send the proper amount of voltage to the trailer brakes so that the vehicle and the trailer brake at the same rate. This leads to safer, more predictable braking. To install...
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