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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

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.


Trailer Wiring Harness Installation - 2000 Nissan Frontier

Today on this 2000 Nissan Frontier, we're going to install part number c55362 from Curt. First up we need to find our connection point for our key connector harness. We'll look underneath the passenger side. Along side the spare tire towards the back. Looks like our connection point right here. We need to push down on the small tab here to separate the connectors.


Hopkins Endurance Fifth Wheel Wiring Harness Installation - 2013 GMC Sierra

Today is 2013 GMC Sierra. We're going to install part number 41157. This the Hopkins Endurance Fifth Wheel Goose Neck Wiring Harness. All right, now the first step of our install is to go ahead and find a location for our 7 Pole Connector. This will be our 7 Pole connector, we would like it to install about right here. All right first step is to drill a quarter inch pilot hole.



Fifth Wheel Wiring Harness Installation - 2014 GMC Sierra

Today on our 2014 GMC Sierra, we'll be installing the Bargman fifth wheel Gooseneck 90-degree wiring harness with seven-pole plug, part number 54701-003. We'll go ahead and choose a location to mount our seven-way plug. I know we need to put a pilot hole through the bed. We're going to make sure on the back side that there's nothing that could be damaged. Once we have our quarter-inch pilot hole drilled, we'll come back with a two-inch hole saw. Now we'll take our end of the wiring harness that has two plugs on it and feed it to the hole we just drilled. Now that we have our wires fed down through the two-inch hole, we'll go ahead and take a small drill bit and put a pilot hole into each of the four mounting locations on the plug. Once we have a pilot hole on each of the four locations, we'll go ahead and put the self-tapping screws in place securing the plug to the bed of the truck. Now we'll go and take the end of our wire and route it over into the back of our factory seven-way plug. Now that we have our wires routed over to the backside of the factory seven way, we'll need to unplug the factory seven-way plug. To do this, we'll remove the small gray locking tab.


Tow Ready Custom Fit Vehicle Wiring 118271 Review

Today we will be reviewing part number 118271. This is the Tow Ready T1 vehicle wiring harness for factory tow packages. This is a 7-way trailer connector, designed to currently fit 2013 and 2014 GMC Acadias, all models, Buick Enclave all models, and Chevrolet Traverse all models. This is going to provide that 7-way blade style of trailer connector at the back of your vehicle to power your trailer's signal lights. It is designed for use with factory tow packages and compatible 4 pull, 5 pull, and 6 pull adaptors that are sold separately. This system connects quickly and easily. No cutting or splicing of wires is needed.




Custom Fit Vehicle Wiring Questions and Answers

  • Troubleshooting Trailer Running Lights on a 2011 Kia Sedona
  • It sounds like the problem is on the trailer side of the wiring equation since your running lights seem to work on your boat trailer, but to be sure you should test the running light of the 4-way with a circuit tester like our part # 3808. Check out the video I attached that shows how to do this. Its pretty easy, you would basically just need to turn on the running lights of your 2011 Kia Sedona and then test the pin on your 4-way that has a brown wire run to it for voltage. If its there then th
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  • Is Connecting Tow Ready Trailer Wiring Harness to Battery Required on a 2013 Nissan Murano
  • On the Tow Ready trailer wiring harness # 118481 you do need a direct connection to the battery. There may be other 12 volt power sources but the harness is not tested with or rated for use with these other locations. Also by connecting to the fuse panel this person has lost that level of isolation between the trailer wiring and the vehicle wiring. There are different ways in which a power wire can be ran to the battery. Running the wire under the vehicle is one method it is the quickest. The
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  • Wiring Stop Tail and Turn Signal Lights on a Motorcycle with Separate Turn Signals and Brake Lights
  • So it sounds like on the motorcycle you have working turn signals, brake lights, and tail lights. So you just need the proper converter to go from the separate signals to combined. You can use converter # RM-732. This is a non-powered converter that will take the separate brake and turn signals and combine them. You would attach the bike brake light wire to the red wire on the harness. Attach the motorcycle left turn signal wire to the harness yellow wire. Connect motorcycle right turn signal
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  • No Power On Trailer Wiring Harness Installed on a 2012 Jeep Liberty
  • To determine if wiring harness # 118554 is the problem, you will want to test it. With the trailer disconnected you will need to use a circuit tester such as # 3808 to test the pins on the 4-Way end of the wiring harness while someone sits in the 2012 Liberty and runs through each light function. If there is no power on the harness at the 4-Way then you can make sure that 1) the fuse is installed in the power wire, 2) the power wire is connected to the positive battery terminal, 3) the ground
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  • How Does Tow Ready Trailer Wiring Harness Install on a 2006 Ford Freestyle
  • We have not yet had the chance to install Tow Ready trailer wiring harness # 118395 on a Ford Freestyle. However we do have 2 videos showing installation on 2 other vehicles that this harness fits: a 2007 Ford Five Hundred and a 2006 Jeep Grand Cherokee. I have included the links to the videos for you. Installation on your 2006 Ford Freestyle will be similar. I have also included a link to the installation instructions for you.
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  • How Does Tow Ready Trailer Wiring Harness Install on a 2007 to 2013 Mitsubishi Outlander
  • The Tow Ready trailer wiring harness # 118518 has a few different parts that install in different places. The wiring from the front is not actually connected to the wiring at the rear because it is already ran from the factory. I have included link to a video showing installation and to the instructions. The part of the harness that plugs into the front of the vehicle will plug into a factory connector that is under or to the side of the battery. The factory wiring from that point to the back
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  • Adding a 12 Volt Circuit to a Trailer Connector on a 1999 Toyota Sienna to Charge a Trailer Battery
  • First, the 12 volt power from the vehicle battery will only provide a maintenance charger to a trailer mounted battery, it cannot charge it up. The wiring is too small and the battery and alternator on the vehicle are not strong enough to push back the appropriate voltage. It is best to charge the battery using an AC battery charger such as # CTEK56158. Several of us here use this charger and it works beautifully. It will not overcharge a battery and it can revive worn (not dead) batteries.
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  • Which Trailer Wiring Harness for 2013 Dodge Journey with LED Taillights
  • The Curt T-Connector, part # C56154 is a fit for your 2013 Dodge Journey with LED lamps. I have confirmed this with Curt. Tow Ready also offers a similar wiring harness, part # 118536. The Tow Ready connector is rated for a higher amperage than the Curt model, and is a bit higher rated by our customers. Because of this, I'd personally choose the Tow Ready connector over the Curt model. Both these connectors will plug inline with the factory wiring harnesses, and would require no cutting or sp
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  • Tow Ready Custom Fit Vehicle Wiring # 118245 Recommendation for a 2001 Toyota 4Runner
  • That harness you found would plug into the gray connector of the Tow Ready Custom Fit Vehicle Wiring # 118245 that you referenced and thats all you would need to do to have a working 4-way on your 2001 Toyota 4Runner.
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  • Troubleshooting Trailer Wiring Harness Shorting Out on a 2002 Subaru Impreza WRX Sport Wagon
  • First thing you need to do is figure out where the short is on your 4x8 trailer and fix it before you install another wiring harness on your 2002 Subaru Impreza otherwise you will just fry another converter. That's why you are having problems, it has nothing to do with your vehicle. Once you get that situation figured out I would recommend you go with another Curt wiring harness. The correct one for your vehicle is part # 56146KIT. The Curt units use a more modern circuit board than other bra
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  • Tips for Using a Circuit Tester to Install Trailer Wiring Harness on a 2003 Hyundai Sonata
  • First thing I would do is test the circuit tester on the battery of your 2003 Hyundai Sonata. If it doesn't work while being tested on your battery its time to upgrade to a new circuit tester like our part # 3808. If you are probing wires you may not be adequately piercing the insulation of the wire to get to the core of it. You might double check that you are touching the tester to metal core of the wire. If you can find clean metal that attaches to the body or the frame of your vehicle you
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  • Brake Controller Installation on Forest River Motorhome on Chevy Express Chassis
  • The Chevy Express chassis most likely will not have any tow package wiring, but if it did there would be a bundle of wires under the driver's side floor mat up by the firewall. This wiring is more likely to be present if the motorhome has a factory 7-way trailer connector. You can contact Forest River Customer Service at 574-534-4058, and if you provide them with your VIN, they can verify if your vehicle is equipped with the tow package wiring. If the wiring is not present, you'll need to har
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  • Trailer Wiring Recommendation for a 2003 Volkswagen New Beetle
  • Your question came in blank, but it looks like you are looking for a trailer wiring harness for your 2003 Volkswagen New Beetle by the parts you looked at before you submitted this, the vehicle you ran through our fitguide and the part you referenced. If so, the Curt Circuit Protected Converter # C56175 that you referenced would be correct for you as long as you do not have a Turbo model. If you have a Turbo you would want the part # 119178KIT.
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  • Wiring Kit Recommendation For 2009 Volkswagen EOS
  • For your 2009 Volkswagen EOS the Tow Ready Wiring Kit part # 119190KIT is a confirmed fit. This kit includes the powered powered converter with circuit protection to safeguard your Volkswagen Eos wiring and the module. This kit includes everything necessary to hardwire it to your Eos. It also includes a circuit tester that is used to help find wires behind Eos taillights to determine signals. In the kit 20 ft of 12 gauge wire is included for the battery connections. The 12 gauge wire we carry is
    view full answer...

  • Can a 2014 Ford Escape have a Class II or Class III Factory Installed Trailer Hitch
  • I believe you are referring to the question/answer page that I have linked. We have found the same information that you have provided. We have found no evidence that the 2014 Ford Escape had a factory Class III hitch option. However it is still possible that a Class III could be a dealer option, not a factory option. So it is best to measure if any one is not sure what they might have using the help article I have linked.
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  • Where Does a Trailer Wiring Harness Plug Into On a 1998 Mercury Villager
  • The connector on your 1998 Mercury Villager should be located somewhere near the spare tire. It could even be above it. It is not necessarily in the exact same place on every vehicle but should be in the same general area. The harness could be hidden inside of a loom and would not be obvious in that case. If you can trace the wiring from the tail lights they should lead you to the main harness. I know this is easier said than done but it would be the best way to find the main harness.
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  • Plug-In 4-Way Harness For 2006 Chevrolet Colorado Pickup
  • For your 2006 Chevrolet Colorado pickup I recommend the Tow-Ready Custom Fit Vehicle Wiring, part # 118301. This plugs into your Chevrolet Colorado's wiring harness, which is located beneath the truck bed, near the driver's-side frame rail. It requires no splicing or cutting of wires and connects quickly and easily. To keep the 4-way secure and safe I recommend the mounting bracket part # 18144. To prevent moisture and corrosion when making any electrical connections it is always recommen
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  • Can a Trailer Wiring Harness 4-Way Be Stored Outside of a 1999 Jeep Cherokee
  • You should not have to have the factory tow package to install trailer wiring harness # 118369 on your 1999 Jeep Cherokee. In order to stow the 4-Way on the outside of the Jeep you will have to look for a grommet that exists through the cargo area. You will likely have to remove panels and the spare tire to find a grommet. If there is no grommet you will have to drill a hole (careful not to drill through things on the other side!). Then you will need to seal up the hole after routing the 4
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  • Will Tow Ready Trailer Wiring Harness from 2002 Honda Odyssey Fit a 2010 Honda Odyssey
  • The 2002 Honda Odyssey and the 2010 Honda Odyssey do not take the same wiring harnesses though they do look similar. The internal circuitry is different between the 2 different harnesses to accommodate the specific vehicles. For your 2010 Odyssey you will need wiring harness # 118438. I have included a link to a video showing installation of this harness for you. You mentioned ordering a new hitch. The most popular hitch for the 2010 Odyssey is # 87479. I have linked a video installation o
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  • Installing TowReady T-One Vehicle Wiring Harness # 118303 in 2005 Chrysler Pacifica
  • The 4-pole trailer wiring harness you referenced, TowReady T-One Vehicle Wiring Harness # 118303, is a correct fit for your 2005 Chrysler Pacifica. This plug-in harness requires no cutting or splicing of wires since it uses T-connectors that plug in inline with the wiring to your Pacifica tail lights. If there is a white wire with a ring terminal secured to the vehicle's metalwork behind the driver-side tail light this should remain in place. Often white wires with ring terminals are grounds
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