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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








Articles about Custom Fit Vehicle Wiring



Custom Fit Vehicle Wiring Questions and Answers

  • Trailer Wiring Harness Recommendation for a 2012 Kia Sorento
  • Actually we do carry a trailer wiring harness that is confirmed to fit your 2012 Kia Sorento. You would want the Curt Wiring harness part # C56151 if you have the tow package as it has been confirmed to fit your vehicle. Or if you don't have the tow package you would want the # 56146KIT. For a hitch I would recommend the Curt Hitch part # C13073. If you plan on doing some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a...
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  • Troubleshooting Trailer Wiring that Left Stop/Turn is Dim
  • Since the trailer wiring has checked out with a tester it would seem that the problem is actually on the trailer. It sounds like you are experiencing a ground problem. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between...
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  • How to Get the 4-Way Wiring # 18252 Longer than 6 feet
  • What you would need to do is get the # 18252 that you referenced which comes with 6 feet, and then also order the part # 16-4B-1 which is bonded 4-way wiring sold by the foot. Basically you would need to order a quantity of the # 16-4B-1 in the amount of feet of extension you would need so that you would have the proper length of wire to install the 4-way on your trailer.
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  • Nissan 2008 Frontier 12 Volt Accessory Circuit Amperage Rating
  • Most 12 volt accessory circuits that are on 7-ways are rated for 40 amps. I would imagine that is what you have on your 2008 Nissan Frontier, but the only way to know for sure would be to find the fuse related to this circuit in your fuse box and look at the fuse rating. The fuse would most likely be called trailer accessory circuit or something similar. The amp rating should be listed on the top of the fuse so you wouldn't even have to pull it out once you find it.
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  • Where Does the Power Wire for Trailer Wiring Install on a 2008 Chrysler PT Cruiser
  • I attached a link to the video you referenced that shows the Tow Ready Wiring Harness part # 118462 being installed on a 2004 Chrysler PT Cruiser. The battery and intake design might be different on your vehicle from what you see in the video but the process will still be the same. You will need to find the battery under your hood, find the positive battery post (should be marked with a plus sign or the word positive), and then attach the wire to this post through the fuse holder that...
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  • Troubleshooting 4-Way Wire Harness installation On 2009 Cadillac SRX
  • The wiring harnesses and kit, part # HM48895 and part # HM46155 you referenced in your question are not designed to be a fit for your 2009 Cadillac SRX. If you find that you have the correct wire harness for your SRX you can check the wiring to make sure all of the wires have been connected as the instructions state. Also, you will want to make sure the ground wire has been secured to a clean bare metal surface. Loose or corroded grounds can cause some of the same problems you described....
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  • Wiring Brake Controller on 2008 Chevrolet Suburban 2500
  • The power supply wire you are looking for should be taped up on the cab side of your junction box. Some times it is tucked down and hard to see and has to be fished out. If it is not there you can run a wire from the junction box into the cab and splice it to the black wire on the brake controller. Check out the FAQ on installing a brake controller on a similar vehicle at right, and the video of the Tekonsha Brake Controller being installed on a 2008 Suburban. The installation will...
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  • Winch Wiring Recommendation for a Ford F150 at the Rear of the Truck
  • The issue you most likely ran into is that winches draw way more amperage than what the 12 volt accessory wire of your 7-way can provide. You would have needed something like the part # SW2008 to power your winch. Your going to have to start checking all the fuses in the fuse boxes under the hood of your 2006 Ford F150. It's hard to say exactly what fuse or relay blew but it could be more than one. I would check ignition fuses first. If you can't figure it out you may need to tow the...
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  • Where is the Grommet in a 2011 Toyota RAV4 Used for Routing Power Wire to Vehicle Battery
  • I attached a picture that I took from the install video you referenced (also attached), that shows where the rubber grommet will be located in the compartment of your 2011 Toyota RAV4. It's hard to see in the video, but its at the very bottom of the compartment. When not in use the harness will store in the interior of your vehicle, and then when towing you would just need to pull the 4-way out of the hatch, connect it to your vehicle, and then shut the hatch on the wiring. The soft...
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  • Trailer Wiring Harness Recommendation for a 2015 Honda Pilot
  • We do have the correct wiring harness for your 2015 Honda Pilot, I checked with Curt and they list the part # C56170 as a fit for your vehicle.
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  • Recommended Trailer Wiring Kit for a 2011 Chevy Malibu LTZ
  • The Tow Ready wiring kit # 119179KIT you are installing your 2011 Chevy Malibu LTZ can work with 2 or 3 wire systems. Your Malibu is a 2-wire system, as there is one bulb inside each tail light housing that illuminates for both the brake and turn signal functions. I have also included an FAQ and installation video too.
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  • Where on 2011 Toyota Tacoma to Access Reverse Lamp Circuit
  • I'm not sure which LED lamps you were considering, but a 4-pole or pin flat trailer connector doesn't carry a reverse light circuit. You'd need to tap directly into the wiring harness that feeds the vehicle taillights. If you access the area directly behind the taillights, you should easily be able to locate the wire feeding the reverse lamp. Tap the power feed for your LED reverse lights into that circuit. If your Tacoma has the factory 7-way connector, the center pin is connected to...
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  • Wiring Harness Recommendation for 2014 Jeep Grand Cherokee
  • The T-One Vehicle Wiring Harness that you will need for your 2014 Jeep Grand Cherokee is part # 118605. This harness will allow you to quickly and easily install a 4-way trailer connector on your Cherokee. I have also included an installation video for you. The T-One Vehicle Wiring Harness, # 118425, that you mentioned was designed for the 2007-2013 Jeep Grand Cherokee.
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  • Troubleshooting 1995 Ford F-350 that Lost Taillight Circuit After Trailer Wiring Short
  • One of two things happened. Either you shorted out the truck's wiring before a fuse was able to blow or there is another fuse on that circuit that could have blown. Fusible links are often found on older vehicles. These can be hard to find but they are on the circuit to act as another fail safe in the event of a short. The best place would be to start where the trailer wiring harness splices into your vehicle's wiring and then work your way back up the circuit looking for fusible links,...
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  • Will Pollak 7- and 4-Pole Trailer Connector Socket Fit Newer Models of the F-350
  • I checked with my contact at Hopkins and he said the plug-in Pollak 7- and 4-Pole Trailer Connector Socket Part # HM40975 will replace the factory 7-way connector on 1999 - 2014 Ford F-250 and F-350 Super Duty pickups. I have included an installation video of this part on a 2006 Ford F350 at right for you to check out.
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  • Troubleshooting 2012 Suzuki Equator that Door Window and Locks Stopped Working After Trailer Wiring
  • It would seem highly unlikely that the installation of the # 118525 in your 2012 Suzuki Equator would cause your door locks and window to stop working. I would recommend you check the fuses for those circuits on the fuse panel of your vehicle as they are most likely blown. You could try removing the # 118525 to see if the circuits start working again but I would be VERY surprised if that would fix the problem. Your installer could have shorted out something while installing the harness...
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  • Will the Curt Wiring Harness for a 2013 Honda CR-V Void the Vehicle Warranty
  • If installed properly the Curt Wiring Harness part # C56158 that you referenced shouldn't cause any problems. Your best course of action would be to go back to the local installer you used and explain to them what happened as it sounds like the screwed something up. Consumers of aftermarket products are protected by the Federal Magnusson-Moss Warranty Act. You should bring this up with your Honda dealer if you decide to go back there with the problem you have. The Act states that...
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  • How to Clean the Contact Points of a Trailer Connector
  • You have a few options for cleaning the pins of a trailer connector. You could use a wire brush, some fine grit sandpaper, or even Coca-Cola and an old toothbrush. Coke does a great job cleaning corrosion believe it or not. You'll want to rinse the soda off after though since sugary drinks leave a sticky residue.
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  • Manufacturer of 3-Pole Connectors in 2008 Dodge Dakota
  • The Curt trailer wiring harness # 55323 and the TowReady harness # 118323 that you referenced both use the same 3-pole connectors as those shown in your photo. These connectors fit the taillights on your Dakota. They also fit various other models of Dodge, Chrysler, Plymouth and Mitsubishi. With these connectors inserted the vehicle lighting signals will reach the 4-pole trailer connector to power trailer lights. According to my contacts at these companies the connectors are almost surely...
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  • Trailer Wiring Harness for 2013 Subaru Impreza WRX STi
  • There is a wiring option that would work, but you'd need to hardwire in a wiring harness like part # 119147KIT. I spoke with my contacts at Tow Ready, and found that there isn't a plug-and-play option for the WRX STi Sedan model. They do offer a # 118573 plug and play converter, but it has NOT been tested on a WRX STi model, so I can't confirm fit. To install the wiring harness, you'll need a circuit tester like part # 40376. You'll begin by having a helper activate the left turn...
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