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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 - 2015 Lexus RX 350

Today on our 2013 Lexus RX350, we'll be installing the Curt Vehicle Wiring Harness with 4-pull flat connector for factory tow package equipped vehicles, part number 56083. Now to begin our install, we'll first go ahead and remove some of the fasteners of the underbody panel here back by the hitch just below the rear bumper. Starting here we're going to go ahead and remove the screw fasteners along the back edge and on push pin fastener. To remove the push pin fastener, we'll go ahead and pry out on the center to release it and then remove the fastener. Now we'll just gently pull down on the panel exposing the back edge and the manufacturer's tow port. The tow port has a weather tight connector covering the end and we'll need to remove it. To do that you'll press on the locking tab of the connector, pull down and it'll release the end and we can set it aside as it will not be re-installed. As you can see this will expose the manufacturer's 4-pin connector.


Trailer Wiring Harness Installation - 2005 Ford F-350

Today, on our 2005 Ford F350 Super Duty Crew Cab, we're going to be installing the Bargman 5th-wheel and gooseneck 90-degree wiring harness with a 7 pole and a 9 foot long lead. Part number 51-97-410. This vehicle does already have a 7 way gooseneck and 5th-wheel wiring but we're going to be replacing it with a new Bargman 7-way 5th-wheel gooseneck wiring. First remove the existing wiring that's already in place so that we can install our new wiring harness. I moved up here to the bed of the truck and as you can see there is already an existing 7-way plug in the bed that's part of the wiring we just undid underneath. This right here is what we'll be removing. Remove a couple screws that hold it in place. The new Bargman gooseneck 5th wheel wiring will actually tie in with the factory wiring and will allow you to use the 7-way down at the bumper as well as the new 7-way plug that will be mounted up here in the bed.


Trailer Wiring Harness Installation - 2014 Cadillac SRX

Today on our 2014 Cadillac SRX we're going to be installing the Curt T-Connector Vehicle Wiring Harness with a 4-Pole Trailer Flat Connector, part number 56096. We're going to begin here on the lower rear fascia of the vehicle. We're going to need to remove this center section. To do that, we'll need to remove the Phillips head screw here as well as over there. Once your screws are both removed just simply lean the panel downward. There's five little tabs at the top that you'll need to get to release. We're going to go up here underneath the bumper structure itself.


Trailer Wiring Harness Installation - 2012 Chevrolet Traverse

Today on our 2012 Chevy Traverse, we'll be installing the Curt T Connector Wiring Kit, part number C56027. To begin with, we'll need to raise the rear hatch of the vehicle. Then we're going to go ahead an remove both of the taillight assemblies. To do this, there are 2 small plastic tabs that we'll need to remove from each side. They will not be completely removed, as they are connected by a small plastic tether, which you'll need to lift them out of the way so you can remove the one screw that is in each hole. Once you have the screws removed and you pull the light assembly off the vehicle, you need to remove the wiring harness from the back of the light. To do this, you'll squeeze the tab and pull the wiring harness free.


Trailer Wiring Harness Installation - 2014 Cadillac SRX

Today on our 2014 Cadillac SRX, we're going to be installing the Tow Ready T1 Vehicle Wiring Harness with a 4-pole flat trailer connector with vehicles with a factory tow package, part number 118259. Now we're going to go ahead and start here at the center of the vehicle on this lower fascia piece at the rear bumper. We're going to need to remove this screw here as well as this screw here. Both of these are just a Phillips-head, so we'll just be using a Phillips-head screwdriver. Once the screws are out, lean the center door section down, and it'll just pop out of the 5 tabs that are at the top. Now if you look up here underneath the rear bumper right here on the back side, this right here is the plug that we're looking for. Now to make things a little bit easier, we're going to go ahead and remove it from the plastic tab securing it to the bumper.


Trailer Wiring Harness Installation - 2012 Toyota Sienna

Today on our 2012 Toyota Sienna, well be installing the Curt T-Connector with 4-Pole Flat Trailer Connector part number C56106. To begin our install, well first open up the rear lift gate. Here, we can access the fasteners to remove the rear tail assemblies. Theres two for each side. Once we removed the fasteners, then well then go ahead and pop the tail light assembly out of its position. Be careful not to break the fasteners underneath.


Articles about Custom Fit Vehicle Wiring



Custom Fit Vehicle Wiring Questions and Answers

  • Will Harness Wiring For 2014 Hyundai Accent Sedan Fit A Hatchback
  • I spoke with my contact at Curt about your 2014 Hyundai Accent Hatchback. They told me that they have not verified a fit for the plug-in harness, part # C56149, you referenced, but they said it would probably be a fit. They did say that part # C56175 would work for your Accent. It is a non-powered harness, and does require hardwiring into the vehicle wiring. This has a protected circuit module and will give you a 4-way connector at the rear of your vehicle. The installation instructions...
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  • Installing the Curt T-Connector Vehicle Wiring Harness # C56063 on 2010 Ford Flex SE
  • When it comes to installing the Curt T-Connector Vehicle Wiring Harness, # C56063, on your 2010 Ford Flex SE, you will adhere the powered converter box to the frame of the car in the open cavity below the driver's side taillight.
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  • Trailer Wiring Harness for 2014 Nissan Armada
  • Because it would be tapped directly into the wiring harness feeding the taillight assemblies, the Curt # 56146KIT you referred to would work just fine. No relays would be necessary, and the 4-pole trailer connector provided by the wiring harness would indeed provide you with right and left turn, along with brake and running lights. If all you were needing was the 4-pole trailer connector, once installing the # 56146KIT you'd be good to go. If you were needing a 7-way, you'd install the...
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  • Troubleshooting Tow Ready # 118530 Installed on 2007 Volkswagen Passat
  • Can you tell me specifically what the problem is, exactly what isn't working? I see you had ordered the Tow Ready # 118530. Let's start by using a circuit tester like part # 40376 on the pins of the trailer connector as each lighting function is activated. Turn on the left turn signal, and test the pin fed by the yellow wire, the tester should blink. This pin should also make the tester light up when the brake pedal is pressed. The pin fed by the green wire should blink with the right...
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  • Will the Pollak Custom Fit Vehicle Wiring # PK11893-11932 a 2012 Ram 3500
  • Yes it is, I check with Pollak and the Pollak Custom Fit Vehicle Wiring # PK11893-11932 that you referenced will work on your 2012 Ram 3500. I attached an install video for you to check out as well.
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  • How to Choose the Right Trailer Wiring Harness for a 2014 Toyota Highlander
  • The easiest way to determine the wiring harness you will need for your 2014 Toyota Highlander is to have the dealer run the VIN. They can tell you if it is equipped with the factory tow package or not. If it is then you would need # 56042. If it does not have the factory tow package use # 118449. You might be able to test the factory connection point at home to determine if it is functional or not. You would need a circuit tester such as # 3808 or a multimeter such as # BTMT15. Then...
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  • Gooseneck/Fifth Wheel Wiring Recommendation for a 2014 Ram 3500
  • For your 2014 Ram 3500 you would wan the Hopkins Custom Fit Vehicle Wiring # 41157. I checked with Hopkins and this is the correct wiring harness for your vehicle to install a 7-way in the bed of your truck. I attached an install video for you to check out as well.
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  • 4-Way and Mounting Bracket Recommendation for a 2012 Honda Pilot
  • The most popular 4-way mounting bracket we offer that other 2012 Honda Pilot owners use is the Mounting Bracket part # 18144. To see how it installs check out the install video I attached. The 4-way wiring kit you would want would be the part # 118558.
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  • 4-Way and Mounting Bracket Recommendation for a 2012 Honda Pilot
  • The most popular 4-way mounting bracket we offer that other 2012 Honda Pilot owners use is the Mounting Bracket part # 18144. To see how it installs check out the install video I attached. The 4-way wiring kit you would want would be the part # 118558.
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  • Trailer Wiring Harness Recommendation for a 2014 Toyota Prius Two
  • The base model of the 2014 Toyota Prius is the Two. The Curt Trailer wiring harness part # C56147 has been confirmed to fit your Two model 2014 Toyota Prius so it would be the correct harness.
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  • 7-Way Trailer Connector Installation on 2014 Toyota Land Cruiser 76 Series
  • We don't offer a relay kit that would work for your Land Cruiser, but I can explain how to wire it so that plenty of circuit protection would be provided to protect your vehicle from any wiring faults that might occur on the trailer. Keep in mind that my response assumes that the trailer you'll be towing uses a 7-way blade-style trailer connector typical of the US market, like part # A7WCB. The first step would be to determine if your Land Cruiser has a Separate or a Combined taillight...
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  • Troubleshooting Curt-T-Connector On 2008 Dodge Grand Caravan
  • When testing the wire harness on your 2008 Dodge Grand Caravan, you should only see power on the harness when the converter receives a signal from the tail lights. If you have power all the time then that would indicate a short or a bad connection. You want to make sure the black wire with the fuse holder and fuse is connected to the positive post on your battery. Make sure the white ground wire has been secured to a clean bare metal surface. After you have checked all of the connections...
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  • What Are Wire Functions on Factory 7-Way Trailer Connector on 2002 Ford F350
  • The one and only truly reliable method to confirm what signal/function is carried on a vehicle wire is to test it. Wire colors are sometimes common to a certain lighting function; running light signals are often carried on a brown wire, for example. But wire color is neither consistent nor reliable as a means to determine the function carried. A circuit tester like # 40376 is the way to go. If you refer to the linked photo showing a 7-way RV-style vehicle socket you will see the common...
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  • Parts Needed to Install a 7-Way and Brake Controller on a 2006 Jeep Liberty
  • It's possible you would be able to install the part # 20135 on your 2006 Jeep Liberty, you will need to check to see if your vehicle has the necessary connector and if it is active first. You would find the connector at the rear of the vehicle near the drivers side frame rail above the spare tire. Using a circuit tester like part # 3808 test the pins of the connector while applying the different taillight functions. If that all checks out the # 20135 would work for you. If not you...
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  • Correct Curt Wiring Harness Recommendation for a 2013 Mercedes Benz GLK
  • I believe the problem you are experiencing is because you are attempting to install the wrong wiring harness on your 2013 Mercedes Benz GLK. You should be using the part # C56190, not the part # 56200 that is for vehicles with PWM taillights. If you are using the correct harness what you will want to do is use a circuit tester like part # 3808 to test the wires on the input side of the # 56200 to verify that you have all of the wires hooked up to the correct circuits. If the wiring checks...
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  • Comparing Trailer Wiring Harnesses for a 2011 Chevy Camaro
  • The Curt trailer wiring harness for your 2011 Chevy Camaro, # 56089, plugs in line with the vehicle tail light wiring and will be grounded using the separate white ground wire with the ring terminal on it. It does not have a converter or circuit protection. Tow Ready wiring harness # 118486 also plugs in line with the tail light wiring, has a separate ground wire but also has a powered converter for circuit protection. The power wire and in line fuse are what actually powers the trailer...
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  • Trailer Wiring Harness Recommendation for a 2013 Ford Edge
  • It would appear as if the Replacement OEM Wiring Harness part # C56110 that you referenced would work on your 2013 Ford Edge since you have what looks like the correct port for it. By the way, thanks for the picture. What you can do to verify that the plug is active is use a circuit tester like our part # 3808 and test the different pins you see for voltage when the brakes/blinkers/running lights are on. If the pins carry voltage with the use of your taillight functions then the # C56110...
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  • Is a 7-Way Bracket Needed to Install the 7-Way of the # 118265 on a 2012 Honda Pilot
  • Most people install the 7-way in the area just to the right or the left of the hitch opening when they install the trailer wiring harness part # 118265 on a Pilot like your 2012 model. Check out the picture I attached. However, if you wanted to you could use a bracket like part # PK12711U-26.
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  • Parts Needed to Install a 7-Way and Brake Controller in a 2013 Ford E250 Van
  • Since you referenced the Curt Harness part # C56020 it would appear as if your 2013 Ford E250 does not have any trailer wiring present at the rear of the vehicle currently. To start you will need to install this harness. Next you will need to convert the 4-way to a 7-way. For that you will need the Brake Controller Installation Kit part # ETBC7. This comes with everything to make the conversion plus everything needed to install a brake controller. Check out the install video and installation...
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  • Solution for Bypassing a Factory Trailer Wiring Harness on a 1997 Ford F-150
  • If all you need is a 4-way and are tired of messing with the headache of tracking down wiring problems a simple solution would be to install the part # 118344 on your 1997 Ford F-150. This will simply install in-line with your truck's taillights and will provide you with a 4-way. I also attached an FAQ article on troubleshooting 4-way installs for you to check out.
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