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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 - 2012 Lincoln MKZ

Today on our 2012 Lincoln MKZ, we'll be installing the Tow Ready Custom Fit Vehicle Wiring Harness, part number 119179KIT. To begin our install, we'll first need to access the wiring behind the taillight assemblies. To do this, we'll start by removing the rear cargo liner and spare tire cover. Then we'll need to remove the rear threshold. There are six fasteners that we'll need to remove. These are push pin fasteners, so we'll gently pry out on the fastener until it releases. Once we have all six fasteners removed, we'll gently pull up on the rear threshold until the fasteners underneath release.




Trailer Wiring Harness Installation - 2011 Volkswagen Routan

Today on our 2011 Volkswagen Routan we will be installing the Tow Ready T-One connector trailer wiring, part number 118490. Now on this particular vehicle the cover has some slots in it and we we're able to fish the wire through it and then pull enough length out to reach the center of our hatch area to make the connections as if we we're connecting to a trailer. You will notice the weather trim is soft enough that the wires will not be crushed, but you want to keep it away from the center latch area so that you do not damage the wires when the rear hatch is closed. Now we'll go ahead and close it and show you what it looks like. Now we'll open it back up and we'll show you how the wire is stored. You can actually store the extra length in this compartment area, keeping it out of your way and from being damaged. To begin with we will raise the rear hatch.


Trailer Wiring Harness Installation - 2004 Ford Freestar

Today on our 2004 Ford Freestar, we'll be installing the Curt T Connector Vehicle Wiring Harness for factory tow package four pole flat trailer connector. It's part number 56073. To begin our install, we'll start underneath the vehicle near the center, just behind the rear bumper. Here we can locate the manufacturer's tow port and remove it from the bumper panel. We'll use our trim panel tool or a flat bladed screwdriver. Once removed, we'll then need to remove the weather cap off the connector. To do this, I'll just use a flat bladed screwdriver and pry back the locks in the weather cap and then remove it.


Articles about Custom Fit Vehicle Wiring



Custom Fit Vehicle Wiring Questions and Answers

  • Replacement Trailer Connector for a 2011 Ford Super Duty Pickup Truck
  • If you are talking about the door (or doors in the case of # HM40975) they are not available separately. You would need to replace the whole trailer connector. You could use # HM40975 or # 20119 for your 2011 Ford Super Duty.
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  • Trailer Wiring Recommendation for a 1998 Jeep Grand Cherokee Laredo
  • The final authority on whether or not a vehicle had a tow package would be a Jeep dealer for your 1998 Jeep Grand Cherokee. Or, you can see if your vehicle has the connector behind the rear scuff panel in the rear cargo area and then test it with a circuit tester like part # 3808 to determine if it is active. For more info on where this connector is check out the installation instructions I attached to the right for the # C55260. If it's there then the # C55260 would work as a wiring...
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  • How to Install a Trailer Hitch and Wiring on a 2010 Ford Edge
  • The video for the 2010 Ford Edge and wiring harness # 118551 is being fixed but it will be basically identical to the video for the 2009 which I have linked for you to the right. We have not had a chance to install all of the hitches we have available for your vehicle on a 2010 model but the hitches fit a range of years of the Ford Edge because the platform is the same for all model years of that generation. So a video for a 2009 or 2011 for example would show the same process as it...
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  • Trailer Wiring Harness Recommendation for a 2003 Dodge Ram 1500
  • For a wiring kit that would install in your 2003 Dodge Ram 1500 I recommend the Curt Wiring Harness part # C55504, which you referenced. This harness plugs inline with your truck's taillights to provide you with a fully functional 4-way. Basically you would just need to unplug your taillight harnesses, plug the harness into the connector of the # C55504 and then plug the other end of the harness into the taillight assembly. Check out the installation instructions I attached for this...
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  • Snowmobile Trailer Running Lights Stop Working, Other Lights Fine, Towed with 2013 Subaru Outback
  • This sound like a bad ground. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. 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...
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  • Troubleshooting Trailer Wiring Harness Shorts Out Every Couple Years on 2003 Chrysler PT Cruiser
  • What usually causes taillight converter wiring harnesses like the part # 118462 to break is a short on the trailer wiring or they get overdrawn. Before you replace your wiring harness I would recommend you make sure that the wiring on your trailer isn't damaged anywhere which would cause a short and fry the converter. Look for corrosion or exposed wire and fix as necessary. Also, when you do replace the harness I would recommend you go with the Curt harness part # C55532 instead as...
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  • 5th Wheel Trailer Wiring Harness for the Bed of a 2015 Ram 2500 Bighorn
  • Dodge, Ford, and GM, along with some import manufacturers all started using the same type of harnesses on their trucks equipped with factory 7-Way trailer connectors. They use the round plug style that is found on 5th wheel/gooseneck wiring harness # 50-97-410 so you can use it on your 2015 Ram 2500 Bighorn. If you want to make sure, just look at the back of your trailer connector. Release the locking tabs and pull the harness from the back of the connector. The connector that plugs...
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  • Which Hitch Fits 2011 GT500 and is Nearly Invisible
  • I recommend going with Hidden Hitch trailer hitch part # 60280. When this hitch is installed on a 2011 Ford Mustang GT500, the rear fascia will conceal everything with the exception of the receiver. I am including a link to the installation instructions of this hitch and it will show a picture of where the hitch will be located on the car in relation to the rear fascia If you plan on doing some towing the hitch comes with the correct ball mount, pin, and clip. For a 1-7/8 inch ball you...
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  • Tips for Routing Trailer Wiring Harness Power Wire to Battery on a 2011 Kia SOrento
  • Wire loom is not necessary but it can be used to protect the wire. You can get a 10 foot long section # 7509-10. You would likely need more than 10 feet though. Routing the wire on any vehicle is a matter of preference. There are basically 3 ways to do it: under the vehicle exposed, under the vehicle not exposed or partially exposed, and through the vehicle interior. I have included a link to the right to a help article I wrote with tips on routing the power wire.
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  • Components Needed To Install Brake Controller On 2008 Ford F-150 With 4-Way Harness
  • Installing a brake controller like part # 90195 on your 2008 Ford F-150 that has a 4-way connector installed requires a couple of things. Along with the controller you can use the brake controller harness, part # 3035-P. Simply plug one end into the back of the brake controller and the other end into the built-in harness beneath your vehicle's dash. The # 118247 harness is not designed to work with you 2008 Ford F-150. This is designed to fit 2004 F-150 only. What you will need in...
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  • Running Lights Not Working On Trailer Connected To 1999 Toyota Land Cruiser
  • The first thing I recommend is to make sure you isolate the problem causing the running lights not to work on your trailer. You can check the lights on the trailer with a 12 volt power source while disconnected from your 1999 Toyota Land Cruiser. Many times there can be a broken wire, a loose ground, or corrosion build-up that is causing the problem. If everything checks okay you can then move to the vehicle. Check the connector on the rear of your 1999 Toyota Land Cruiser to see...
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  • Best Tow Bar Wiring Harness Recommendation for a 2015 Jeep Wrangler Unlimited
  • For tow bar wiring for your 2015 Jeep Wrangler Unlimited you are going to want the part # HM56200. This harness installs easily by plugging in line with the taillights of your vehicle. I attached an install video for you to check out as well. The # C55124 that you referenced is trailer wiring and would not work for what you are doing.
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  • Trailer Wiring Recommendation for a 2012 Isuzu NPR-HD Diesel
  • We don't have any custom fit wiring harnesses confirmed to fit your 2012 NPR-HD, but since your taillights have a combined circuit I can recommend you a wiring kit that would work for you. I would recommend the Curt Wiring Harness part # 56146KIT. I attached an install video an installation instructions for you to check out as well.
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  • Trailer Wiring Harness for 2006 Maserati Quattroporte
  • We don't have a vehicle specific taillight converter for your Maserati. Although there are several different universal converters like # 119179KIT, it hasn't been tested on your vehicle so I would be hesitant to recommend it. I'd recommend checking with your Maserati Dealer to see what they recommend.
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  • How to Troubleshoot Factory Trailer 7-Way Plug for Power
  • The first place I would check is your 2004 GMC Sierra's fuse panel. Look at all fuse locations labeled trailer or tow to double check if any fuses are missing or blown. If the fuses are intact I would still check each fuse for signs of corrosion. Fuses that have been in place for 10 years could easily have developed a white or green film that could interfere with contact. There may be a wire under the hood that requires connection to activate the 12V circuit. The linked FAQ illustrates...
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  • Wiring to Passenger Side Too Short on Curt Trailer Wiring Harness for 2014 Dodge Grand Caravan
  • This issue is not uncommon and it is not just Curt that has this issue. The trick is to use the most direct path possible when routing the wiring from the driver side to the passenger side. But they do not explain what that best route is. What a lot of people end up doing is splicing in some extra wire because finding the best route that does not require extra wire is too time consuming. When we installed Curt harness # C56150 on a 2014 Town and Country we had just enough wire to reach...
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  • Adding a 7-Way Trailer Connector to a 2011 Jeep Wrangler Unlimited
  • The harness that you need is an OEM part. A dealership would have it or be able to get it. I would ask them though if there is anything else needed to make the 7-Way active on your 2011 Jeep Wrangler Unlimited. The 7-Way # HM42190 is designed for models that have the factory tow package. If your Jeep did not come with the factory tow package and you do not want to spend the money on dealer parts then you can install a 7-Way using a different method. You would start by installing a...
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  • Parts Needed to Bypass the Factory Trailer Wiring of a 2005 Dodge Ram
  • The trailer wiring circuits on the mid 2000's Dodge trucks had some interesting issues. The easiest way to deal with them is to bypass the factory trailer wiring. To do this with a 7-way like you said you have on your truck you will first need to start with a 4-way. For that you will need the part # C55504. Now if all you need is taillight functions and your trailer does not have brakes all you would need to convert this to a 7-way is the part # 37185. If you do have trailer brakes...
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  • Parts Needed to tow a Trailer with a 2005 Volkswagen New Beetle
  • First thing you want to do is consult the owners manual of your 2005 Volkswagen Beetle to determine if there are any restrictions on towing with your vehicle. For a hitch you would want the part # 24679. I attached a set of installation instructions plus an install video for this hitch to the right. For a ball mount you will need the part # 3593, for a 1-7/8 inch hitch ball # 19256, or depending on your trailer you may need a 2 inch ball. For that you would want part # 19258. You...
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  • Parts Recommendation to Install a Brake Controller in a 2011 Nissan Murano
  • Yes, you can install a brake controller in your 2011 Nissan Murano. If you do not have a 4-way trailer connector at the rear of your vehicle you will need to start with one. For that you would want the part # 55571 unless you have a CrossCabriolet, which in that case you would need the part # 56146KIT. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part #...
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