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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.

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.

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

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.

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.

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

Curt Custom Fit Vehicle Wiring C56032 Review

Today we'll be reviewing part number C56032. This is the Curt T-Connector Vehicle Wiring Harness with the 4-Pole Flat Trailer Connector. This is designed for 2003 Ford F-250 and F-350 Super Duty pickups with deep drop bumper, 2003 to 2004 F-250 and 350 Super Duty pickups with standard or step bumpers., and 2005 to 2007 F-250 or 350 Super Duty pickups only without factory four flat or 708 connectors. This is going to provide a four way flat trailer connector at the back of your vehicle to power your trailer signal lights. It is compatible with 5-pole, 6-pole and 7-pole. All those adapters are sold separately. The four way will plug right into there and convert it to a 5-pole, 6-pole, or 7-pole. This system connects very quickly and easily.

Trailer Wiring Harness Installation - 2010 Chevrolet Express Van

Today on our 2010 Chevrolet Express van we will be installing the tow-ready T1 vehicle wiring harness with four pole flat trailer connector, part number 118392. We will begin here at the rear of the vehicle and we'll need to open up the two rear cargo doors. Now, let's go ahead and point out the two connection points we'll be tying our T1 wiring harness in with. Now, to disconnect the factory wiring harness, we'll simply push in on the locking tab and gently pull the connection point apart. Now, we'll go ahead and take our T fitting for over here on the driver's side. We'll be using the one that has three wires. The white wire with the ring terminal for the ground and the brown and yellow wires that are tied in with the T connection.

Trailer Wiring Harness Installation - 2009 Chevrolet Express Van

Today on our 2009 Chevrolet Express Van, we'll be installing the tow ready T-1 vehicle wiring harness with four pull flat trailer connector, part number 118392. First, we'll go ahead and open up the rear doors of the van. Now, we'll begin over here on the passenger side. We'll need to locate the factory connector and we'll need to unplug it. We'll then add our T connector inline. To unplug the factory connection, we'll push in on the little tab right here and gently pull the connection apart. We'll then take the two connectors that are at the end of the green wire and add them inline here, making sure that when we put the connection points back together, the locking tabs fully engage. Then we'll go ahead and route our green wire up and around the door area, using a few zip ties to secure it to the factory wiring harness.

Trailer Wiring Harness Installation - 2012 Dodge Grand Caravan

Speaker: Today on this 2012 Dodge Grand Caravan, were going to install part number C56150 from Curt. First step is go ahead and open the back hatch because we have to remove the taillight. To remove our taillight, there are two bolts that we have to remove. Well use a 10mm socket to do that. Now, well go ahead and work our taillight loose. Sometimes, you can pull back on the top and bottom and work it out.

Trailer Wiring Harness Installation - 2006 Ford Taurus

Today, on this 2006 Ford Taurus, we're going to install part number 18252 from Draw-Tite. Now, to saw our wire harness, we have to have access to the wiring. To do that, we're going to go ahead and start off on the passenger side. We will then loosen up the passenger trunk to get access to a wiring on that side. Okay. Now, some vehicles have another plastic rivet up in the liner in this area to make it easier to pull down, but we don't have to worry about it on this one. Now, here's our wire harness, right here.

Curt Custom Fit Vehicle Wiring C56001 Review

Today we will be reviewing part number C56001. This is a Curt Fifth Wheel Gooseneck Custom Wiring Harness with a 7-pole connector. It's going to measure ten feet in length. What this does is it's going to provide the seven way connection that you need in your truck bed for hassle free hook up of your fifth wheel and gooseneck trailers. The connector is going to mount in your truck bed, your side wall or tailgate post. It can also mount in your wheel well, and it's also going to retain the factory 7-pole trailer connector at the rear of your truck if you already have that in there. What this does is it actually plugs into the factory wiring, no cutting or splicing of wires is needed. This system actually works as a splice.

Trailer Wiring Harness Installation - 2009 Volkswagen Tiguan

All right today on this 2009 Volkswagen Tiguan we're going to install part number 119190KIT. We're going to have to open the back hatch to get access to the tail lights. We're going to use the T25 torx bits to remove the tail lights. Pull back on the tail light and then we release it from the wire harness. There's two tabs to push in and then we can work it off. Okay we'll start the tail lights to the side. We're going to run our wires through here and down to our hitch eventually.

Custom Fit Vehicle Wiring Questions and Answers

  • 4-Way Trailer Wiring Recommendation for a 2014 Honda Pilot
  • The simplest and easiest way to install just a 4-way on your 2014 Honda Pilot would be to install a Tow Ready Wiring harness part # 118558. This kit will connect to your 4x8 trailer once installed and will control the taillight functions.
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  • Troubleshooting No Trailer Running Lights after Installing Tow Ready Harness part # 118562
  • I would start by checking the truck out with a circuit tester, item # 3808 if needed, first. You should get left turn and brake signals on the yellow wire, right turn and brake signals on the green wire, and running lights on the brown wire. The white wire is the ground wire. If the vehicle signals are all functioning properly at the trailer connector then you know the problem is on your trailer. I suspect the problem is either corrosion in the trailer connectors on the running lights circuit
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  • Routing the Power Wire for a Trailer Wiring Harness on a 2009 Honda Odyssey
  • I think you are looking at the Expert question and answer pages for the Curt trailer wiring harness # C56190. The link is on the right hand side of those pages and it is called Routing the Power Wire for a Trailer Wiring Harness. I have also included it here to the right hand side of the page.
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  • Parts Needed to Install a 7-way and Hardwire a Brake Controller on a 2001 Dodge Ram Van 1500
  • That we are aware of there isn't a trailer wiring harness present at the rear of a 2001 Dodge Ram Van. However, you could use a circuit tester like our part # 3808 and test the circuits of the harness for taillight functions. Check out the video I attached that would show you the basic principal of testing the functions. Since we do not have a connector that would connect to that harness you could use those circuit in that connector to install a Draw-Tite 4-way part # 18252. Install video at
    view full answer...

  • Factory Tow Package Connection Point to Install Trailer Wiring on a 2005 Toyota Highlander
  • If your 2005 Toyota Highlander came with the factory tow package then the factory connection point to add a 4-Way will be located behind the driver side interior trim panel in the rear cargo area of the vehicle. You would then use wiring harness # 118248. I have linked a video showing installation and a link to the instructions for you. If that connector is not present on your Highlander then you will need to use harness # 118413. This wiring harness just plugs in line with the vehicle tail
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  • Trailer Hitch for a 2014 Toyota Highlander
  • I spoke with my contact at Curt and trailer hitch # C13169 is a fit for the 2014 Toyota Highlander. I have included a link to the installation instructions for you to view. And for trailer wiring you can use # 118449. I also recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with clip, and a storage bag.
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  • Recommended Wiring Harness For 1988 Toyota SR5 Pickup Truck
  • For your 1988 Toyota SR5 Pickup truck the wire harness with a 4-way flat connector I recommend is the Tow Ready Wiring, part # 119179KIT. This kit comes with the upgraded circuit protected Modulite, that protects the truck electrical system from shorts. The kit also includes the electrical circuit tester and the installation instructions.
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  • Will the Curt T-Connector Vehicle Wiring Harness # C56020 fit a 2004 Ford E-250
  • Yes, the Curt T-Connector Vehicle Wiring Harness # C56020 that you referenced fits 2004-2010 Ford E-150, E-250 and E-350's so it would work for you. I attached an install video for you to check out also.
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  • Trailer Wiring Harness Recommendation for a 2013 Toyota Highlander
  • The Curt Harness part # C56217 and the Tow Ready Harness part # 118449 that you referenced are two different brands version of the same wiring harness. Both would install the exact same and would work well on your 2013 Toyota Highlander. I am partial to the Curt unit though since it uses a more modern circuit board (surface mount vs. diodes) and can handle a slightly higher amperage draw at 3 amps per stop/turn light circuit and 6 amps per tail light circuit vs. the Tow Ready that can do 2.1
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  • Trailer Lighting Malfunction After Installing CURT T-Connector Vehicle Wiring Harness # C56160
  • First verify that the left- and right-side T-connectors are inserted fully into the vehicle connectors and that you have the correct left and right plugs connected. The connector with the yellow wire connects on the driver's side and the connector with the green wire connects at the passenger side tail light. Next I suggest you find a new location for the white ground wire. A weak or marginal ground can let some functions operate properly some times, but may still be the cause for the erratic
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  • Running Light Pin has Power All the Time on Trailer Wiring Harness for a 2008 Volvo XC90
  • If the trailer has LED lights then it is possible that there is some bleed over because wiring harness # 118411 is a powered converter. To see if this is the issue you can unplug the fuse from the fuse holder. If the issue stops then this is likely what the problem was. If the trailer does not have LED lights then it could be some corrosion where the harness connects to the vehicle on the drivers side. Look for dirt or corrosion and also any bent of broken pins. If this continues to happe
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  • 4-Way Wiring Recommendation For 2014 Honda Pilot With Factory Tow Package
  • Since your 2014 Honda Pilot is pre-wired for a trailer wiring harness, you can use the Tow-Ready T-one Vehicle Wiring harness # 118558. This wiring harness will connect in the rear hatch cargo area and behind the bumper of the vehicle. The kit does have other components included but you will not need to use them since you have the tow package. The red arrow on the included photo shows the part of the kit you would need to use in step 6 of the included installation instructions. You may also
    view full answer...

  • Can a 4, 5, and 7-Way Be Installed on a 2012 Honda Pilot Using Trailer Wiring Harness 118265
  • If you wanted to permanently install a 7-, 4-, and 5-Way vehicle side trailer connector to work with harness # 118265 you will have to hardwire in # HM48470. But you would have to cut off the end of the # 118265 harness that plugs into its 7-Way and hardwire in the wires by function to # HM48470. An easier option is to keep the 7-Way that came with the wiring harness for your Honda Pilot and when you need to tow a trailer with a 4 or 5-Way then use a simple adapter, # 37385.
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  • No Power On Green Output Wire with Brake or Hazards On Curt Wiring Harness 56146
  • The likely issue is a either going to be a poor ground connection or a problem inside the converter box. Make sure that the white ground wire is attached to a clean bare metal surface. Moving the ground could also help. If he problem persists then there is likely a problem inside the converter box and it will need to be replaced. The Curt wiring harness has a limited one year warranty.
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  • Running Light Voltage is Good Going in But Not Coming Out of Trailer Wiring Harness C56150
  • Since the voltage is correct going into the converter box but not correct coming out, that indicates that there is something wrong inside the converter for wiring harness # C56150. There is no fix for this and the whole harness will need to be replaced. The Curt wiring harness has a limited one year warranty. I have included a link to our help article that you can view on testing 4-Way trailer wiring harnesses as well.
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  • No Light Signals After Installing TowReady T-One Trailer Harness # 118579 on 2014 Chevrolet Traverse
  • The trailer wiring harness you purchased recently, part # 118579 from TowReady, is indeed a correct fit for your 2014 Chevrolet Traverse, and thank you for your business. If none of the pins on the 4-pole flat trailer connector on this harness deliver a signal to your tester when the appropriate functions are activated on the vehicle then I would first check the 12V power input to the harness. This wiring connection is required for all light functions and a problem here would explain the comp
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  • Fifth Wheel Trailer Connector for 2011 Dodge Ram 3500 Dually
  • The Pollak # PK11893-11932 fifth wheel trailer wiring connector you referenced would indeed work well for your 2011 Ram Dually. I however prefer the Hopkins # 41157, because it comes fully assembled. Getting the wires plugged into the Pollak model can be tricky, you wouldn't need to mess with it if you used the Hopkins connector.
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  • Trailer Wiring Harness Options for a 2010 and Newer Toyota Prius
  • The third generation Toyota Prius starting in the 2010 model year can use Curt trailer wiring harness # 56146 but you would want the kit, # 56146KIT, which includes extra wire, fuse and fuse holder for the battery connections, quick splice connections, and a circuit tester. You could also use a T-one harness # 118505 that will just plug in line with the vehicle tail lights to get the correct signals but still is a powered converter and requires a direct battery connection to power the trailer
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  • How to Remove Front Grille of 2014 GMC Sierra 1500
  • If you Google "how to remove grille from 2014 Sierra", you'll see several You Tube videos showing the process. Once the radiator cover and upper four bolts are removed, there are actually four 10mm bolts that hold the grille in from underneath. Two near the center and two under the headlight assemblies. Once those are removed, you might have enough give in the grille. If not, there are two 7mm bolts in each wheel well that attach the bumper pad to the vehicle. Once those final bolts are remo
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  • Installing LED Tailgate Light Bar on 2014 Ford F250 Using # 118158 Vehicle to Vehicle Converter
  • What you are wanting to use is separate signals from the brake lamp and the turn signals. Using the 118459 would actually get you the opposite of what you're looking for. Use the # 118158 converter, and wire the inputs into the wiring feeding your trailer connector. The converter will separate out the brake signal for you. The orange wire from your light bar would connect to the red output wire from the converter. The green and yellow wires from the light bar would connect to the green and yello
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