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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 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.


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

Fifth Wheel and Gooseneck Wiring Harness Installation - 2004 Ford F250

Today, on this 2004 Ford F250, we're going to install part number PK11893-11932. First thing we want to do is we'll go ahead and take the wires and install them to the socket. They just snap into place. Let's start off with number one and we'll install the red wire. Number two, we'll install a white wire. Number three, well get the blue wire.


Tow Ready Custom Fit Vehicle Wiring 118581 Review

Today, we're reviewing Tow Ready, part number 118581. This is a T1 vehicle wiring harness with the four-pole flat trailer connector. Its made for your Subaru Impreza. This is the four-pole flat, and it does come with a dust cover. To find out whether this will work with your Impreza, check the chart at the bottom of the product page. It will list the type of Impreza and model year that this will work with.The first thing you want to do is install your T connectors.


Trailer Wiring Harness Installation - 1999 Ford Ranger

Today on our 1999 Ford Ranger, we'll install the custom fit vehicle wiring harness 4-pole connector, part number 118241. To begin our install, we'll first need to locate the manufacturer's tow port. For this application, it's behind the bumper here on the driver's side. To gain access to it, we'll just take a trim panel tool or flat blade screwdriver and pry the connector free from the secured point behind the bumper. Then once we have access to the connector, we'll need to remove the weather cap. To do that, we'll press in the locking tab and pull it out from the connector.


Curt Custom Fit Vehicle Wiring C55537 Review

Today, we're going to review Part Number C55537, this is the Curt T-connector Vehicle Wiring Harness with the four-pole flat trailer connector. This part is designed for the 2004 to 2007 Dodge Caravan, Dodge Grand Caravan and the Chrysler Town and Country. This will provide a four-way flat trailer connector at the rear of your vehicle to power your trailer's lights. It does connect quickly and easily. There's no cutting or splicing. What you will do is locate the connection points or the back of the tail lights of your vehicle.


Curt Custom Fit Vehicle Wiring C56172 Review

Today were going to review part #: C56172. This is the Curt T-connector vehicle wiring harness with the four pole flat trailer connector. This wiring harness is designed for the 2011 to 2013 Ford Explorer. This will provide a four-way flat trailer connector at the back of your vehicle to power your trailers signal lights. This does connect quickly and easily. Theres no cutting or splicing of the wires.


Curt Custom Fit Vehicle Wiring C56171 Review

Today were going to review part #: C56171. This is the Curt T-connector vehicle wiring harness with the four pole flat trailer connector. This wiring harness is designed for the 2012 to 2013 Hyundai Azera vehicle. Also, the 2011 to 2013 Ford Explorer without the factory seven-way connector. This kit will provide a four-way trailer connector at the back of your vehicle to power your trailer signal lights. It connects quickly and easily.


Bargman Custom Fit Vehicle Wiring 54701-003 Review

Today were reviewing part number 54701-003 from Bargman. This is a fifth wheeler gooseneck 90 wiring harness with a 7-pole plug. It fits Chevy, GMC, Dodge, Ford, Nissan, and Toyota trucks that have a factory tow package. Ill show you that in a moment. This is the seven-way that fits on the side of your truck bed, and it fits just like that. It does come with a cover to protect it from the elements.


Pollak Twist-In Trailer Connector Installation - 2011 Chevrolet Silverado

All right. Today, on this 2011 Chevrolet Silverado, we're going to install Part Number PK11916. Now, our truck has a cap for the wiring harness, but doesn't have a plug in it all ready. So first step, we're going to go ahead and remove the cap. Looking at the cap in the bumper, we'll push down on a small tab on the left hand side. We'll use a screw driver to help push it out then we'll twist the cap.




Custom Fit Vehicle Wiring Questions and Answers

  • Left Turn Signal On 7-Way Trailer Connector is Not Working
  • It is possible that there is a blown fuse or relay related to the tow package wiring that is causing the problem. Use the vehicle owners manual to find the locations. It is also possible that there is a break in the wire somewhere. You will need to use a circuit tester like # 3808 if needed to test the wire as you work your way forward on the truck. If the right side stop light also does not work it could be a blown stop light or CHMSL fuse. If the turn signal function works on that same
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  • Parts Needed to Convert a 4-way to a 5-way for a Honda Odyssey Towing Surge Brake Boat Trailer
  • You are going to need to install a Adapter 4 Pole to 5 Pole # 20036. This product will plug right into your 4-way and then you will run the blue wire from the adapter to your reverse light circuit and then you will have a fully functional 5-way that will allow the trailer brakes to release when you reverse your trailer. I attached an install video for this product to show you how it installs.
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  • Fuse Location for Trailer Wiring Harness 118255 for a 2010 Lexus 450h
  • I spoke with my contact at Tow Ready about wiring harness # 118255. He stated that the build sheet for he harness only shows one fuse included. However, it is possible that you may need to install a fuse in a fuse panel to make everything fully functional. Before doing this, you will want to determine if the wiring harness is functioning by using a circuit tester like # 3808 if needed to test the 4-Way while someone runs through the lighting functions on the vehicle. If you have only one fuse
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  • Trailer Lights Not Working After Install Wiring Harness on a 2014 Kia Sorento
  • To determine if the problem is with the vehicle or the trailer, first disconnect the trailer from the vehicle. Then use a circuit tester like # 3808 or the one that came with # 119147KIT. Test the pins on the 4-Way using the circuit tester while someone sites in the vehicle and runs through the functions. If all the signals are correct on the 4-Way when you test it then the issue is on the trailer. But if the signals are not correct then there is a problem with either the wiring harness, inst
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  • 7-Way Trailer Wiring Harness Stopped Working On a 2011 Honda Pilot
  • The first thing I recommend doing is checking the vehicle side connector for dirt and corrosion build up at the 4-Way. I had a friend that had this problem. The 4-Way had enough corrosion in it to cause the lights not to work. After clearing it out, it worked fine. You could use a circuit tester such as # 3808 if you do not have one to test the wires at the back of the 4-Way to determine if the signal is getting through to that point. That would confirm a problem with the plug, most likely co
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  • No Light Signals at 4-Pole Connector After Installing Tow Ready Harness #118373 in 2001 Lincoln LS
  • If you have no light signals at all at your 4-pole connector (no turn, tail or brake lights) then either the powered converter in this harness may have been damaged in the first installation effort, there is a faulty 12V input power connection to the converter, a bad ground connection or there is a problem within the wiring in the vehicle or trailer. The installation instructions are included in this email in case you no longer have the original printed copy. I have also linked an article o
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  • Trailer Tail Lights Not Working after Installing Tow Ready Wiring # 118491 on a 2010 Honda Pilot
  • Thank you for advising the troubleshooting steps you have taken. Installation of this trailer wiring harness # 118491 in your 2010 Honda Pilot requires you to insert components in four separate locations within the vehicle. The 4-pole wiring connects to the plug under the rear bumper; the 3 flat fuses and relay are to be installed in the forward of the two driver-side compartments (the one labelled Aux Fuse); the black box plugs into the harness behind the larger rear driver-side compartment;
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  • Purpose of Relays Included with Tow Ready # 118266 Trailer Wiring Harness for 2012 Nissan Frontier
  • According to my contact at Tow Ready, all three relays are used regardless of the transmission in your Frontier. The brown relay activates the 12-volt accessory circuit feeding power to your 7-way, and the blue relays activate the right and left turn signal/brake light circuits. I have linked you to the installation instructions for you to review.
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  • How to Install the Tow Ready T-One Wiring Harness # 118420 on a 2013 Honda Accord Coupe EX-L
  • The connections for the Tow Ready T-One Wiring Harness, # 118420, on your 2013 Honda Accord Coupe EX-L are behind the tail light assemblies. The connectors on this harness will simply tee into the existing tail light connectors on your tail light assemblies. We have not had the chance to install this wiring harness on a 2013 Accord yet, but on previous year Accords, to access the tail light connectors, you need to remove the spare tire cover, the rear threshold and peel back the carpeting co
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  • 7-Way Wiring Harness Recommendation for a 2012 Toyota Tundra with a Factory 4-Way
  • I wish I had a plug and play 7-way that would install on your 2012 Toyota Tundra that would replace your 7-way. But you will need to hardwire in a 7-way. If you only need a 7-way for a trailer without trailer brakes you could get away with just getting a # 37185 and just plugging in your 4-way to it. If you need to install a brake controller and operate trailer brakes you will need to get a Brake Controller Installation Kit part # ETBC7. This comes with everything you will need to install a f
    view full answer...

  • Trailer Wiring Harness Recommendation for a 2013 Honda Ridgeline
  • For a 4-way wiring harness for your 2013 Honda Ridgeline you would want to get a Tow Ready Custom Harness # 118400. I attached an installation video for this kit as well as installation instructions for you to check out. Current pricing is available on the product page.
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  • Parts Needed to Install a 7-way on a 2006 Ford E-150
  • The Replacement Multi-Tow 7-Way & 4 Pole Trailer Connector # 20119 that you referenced is designed as a replacement for a 2006 Ford E-150 with a tow package that has the OEM harness. You might look under the rear end of your vehicle to see if you can find the round socket. If you do not have a factory 7-way already you should not find one unfortunately. If you have no trailer wiring connectors at the rear of your vehicle I would recommend you start with a Curt T-Connector Vehicle Wiring Harne
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  • Purpose of White Wire on Curt T-Connector # C56029 for 2011 Honda Element
  • The white wire with the ring terminal (see photo I edited for you) is indeed a ground wire. It would connect to a factory grounding point under the dash, if available. Otherwise, you can use the included self-tapping screw to attach it to a nearby metal portion of the vehicle body. Before driving the screw in, be sure the area behind it is clear of any wiring that could be damaged.
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  • P2 Brake Controller and 7-Way Recommendation for a 2004 Ford F-150 with factory 4-Way
  • Everything you picked out is exactly what you need for a plug in play install of a 7-way and brake controller on your 2004 Ford F-150 that has a factory 4 pole. It sounds like you already watched the install video for the # 118247, but I attached this also. The 7-way of the # 118247 is the blade style 7-way also. I attached install videos and installation instructions for these products for you to check out also.
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  • How to Tap Into the Reverse Light Circuit of a 2007 Acura MDX for Installing a 5-Way
  • If you open the liftgate of your 2007 Acura MDX you should see a black section of conduit that holds wires that will run from the threshold of the door to the door itself. In that bundle of wires should be a reverse light circuit. What you could do is remove the interior panel behind the threshold where the harness goes and test the wires to find which one is the reverse light circuit. You will need to use a circuit tester like our part # 40376. Aside from that you could try tapping into t
    view full answer...

  • Trailer Wiring Harness Recommendation for a 2004 Jeep Grand Cherokee without Tow Package
  • Since you do not have the tow package I am assuming you do not have a factory trailer connector. In that case I would recommend you get a Tow Ready Custom Fit Vehicle Wiring # 118369. This is the recommended wiring harness for the 1999-2004 Jeep Grand Cherokees, I attached an install video and installation instructions for this product for you to check out also.
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  • Wiring Directions For 2012 Nissan Pathfinder Using Tow Ready Wiring Harness # 118266
  • I spoke with my contact at Tow Ready and he said there should be two mating connectors for the gray and black connectors on the inboard side of the driver side frame rail near the spare tire. He did tell me that Nissan is notorious for moving the wiring on their vehicles and the last information he received was that the connectors were on the top part of the driver side frame rail at the spare tire. The connectors are typically pretty visible and should be easy to spot. Photo C that you refe
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  • Installing Trailer Wiring Harness # 118579 on 2013 Chevy Traverse
  • Due to the fact that the taillight assemblies of the Traverse were changed for the 2013 model year, the part number changed from the 2012 model year. We do not yet have a video showing the new part being installed, but I would be happy to walk you through the process. I have linked you to the video for the wiring harness for the previous model year. Other than the need to run the power wire up to the battery, the procedure for installing the # 118579 on your 2013 model would be almost identi
    view full answer...

  • Location of Trailer Harness Connector on 1996 Geo Tracker 4X4 Automatic Without Jack Compartment
  • Since your 1996 Geo Tracker 4X4 does not have the jack storage compartment shown in the installation instructions, the trailer harness connector is likely to be located behind one of the tail light assemblies or one of the rear interior trim panels. This Tow Ready harness, part # 118372, fits both 2-door and 4-door versions of the Tracker. Start on the driver-side and remove the tail light assembly. Please see the included photograph. This is the most-likely location for the connector. If the
    view full answer...

  • Where Does the C55355 Install On a 2003 Chevy Venture
  • This T-connector will plug into your vehicles wiring harness that is located in the rear cargo area of your van on the drivers-side. I have included a photo showing the location in the rear cargo area of a vehicle similar to yours. I would recommend using some dielectric grease # 11755 when you are installing this wiring harness, this can be used on all electrical connection points and it helps to prevent corrosion. After you have completed the installation of the wiring harness, the 4-w
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