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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 - 1998 Jeep Grand Cherokee

Today on this 1998 Jeep Grand Cherokee, were going to install part number 118349 from Tow Ready. This is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. To start off, we need to go ahead and get inside the vehicle to get access to the wiring. We need to remove the spare tire and well go ahead and remove the threshold. Threshold is out of the way. Underneath the threshold are a couple of screws, one on each side.


Articles about Custom Fit Vehicle Wiring



Custom Fit Vehicle Wiring Questions and Answers

  • Adding Trailer Wiring Harness to a 1999 Ford F-350
  • If your 1999 Ford F-350 came with a factory 4-Way trailer connector, you can add a 7-Way using # 118243. I have linked a video showing installation for you. To add a 7- to 4-Way adapter the most popular option is # PK12716. If the truck did not come with any type of trailer connector then to add a 4-Way you would need to use # 18252. Then to add a 7-Way you would need # ETBC7.
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  • Trailer Wiring Harness for a 2014 Ford E-250 Econoline Van
  • For a 2014 Ford E-250 van that does not have the factory tow package or trailer wiring connector, you will need # 118551. It plugs in line with the vehicle tail light wiring. I have included a link to a video to the right showing how the harness installs.
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  • Installing Trailer Wiring Harness for a 2010 Lexus RX 450h
  • If you haven't plugged in the converter box portion of wiring harness # 118255 (the part with the yellow fuse holder) then the 4-Way will not work until you do. Inserting the fuse in the fuse holder would be the last step. This harness is circuit protected. This means that if there is a short on the trailer it will not damage the vehicle wiring or electronics. You should not have to have the vehicle computer flashed or reprogrammed to use the harness.
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  • Troubleshooting 2009 Nissan Frontier4-Pole Trailer Wiring Harness That Won't Operate Trailer Lights
  • Most likely, your problem is caused by a blown fuse or relay caused by a short in your trailer wiring. First, make sure that the wiring harness that holds the relays behind the passenger side kick panel is plugged in all the way, until it clicks. Make sure the 2 blue relays are fully seated in the harness. You can see the location of the harness by clicking the provided link for the # 118525 wiring harness. You can also check the point where the # 118263 plugs in under the vehicle, making...
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  • After Installing Brake Controller on 2011 Chevy Silverado, Trailer Brakes Lock Up Right Away
  • Do you happen to have a 6-Way trailer connector or are you using a 7-Way to 6-Way adapter? Usually when this happens and a 6-Way is involved it means that the 12 volt circuit and brake output circuit are switched. On just a 7-Way, there could be a short that is causing power draw to the brake output pin. And it could be a problem with the brake controller. There are some tests you can do to test the brake controller. In the truck cab you will need to sever the blue wire several inches...
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  • Gooseneck/5th Wheel Trailer Wiring for the Bed of a 2006 Dodge Ram 3500
  • I recommend going with a gooseneck wiring harness that has a 90 degree bend. The reason for this is because it makes installation easier because on some trucks there isn't a lot of space between the inner and outer bed side walls. Having an extra ground wire is not a bad thing. It helps ensure that the harness has a good ground connection. With that said you can't really go wrong with Bargman harness # 51-97-411. I have linked a video to the right that shows how it installs. For a...
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  • Trailer Running Lights Do Not Work When Towing with 2003 Honda Element
  • All of the trailer wiring harnesses for the 2003 Honda Element (# 118336, # C55336, and # 43105) plug into the factory connection point on the vehicle. This makes me think that the issue could be a blown or missing fuse. Check the vehicle owners manual for the fuse locations for towing or trailering to see if any are blown or missing. You can test the wiring harness by following the help article I have linked to the right. If everything checks out on the vehicle then it indicates a problem...
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  • Fuse and Relay Locations for Tow Package Wiring on a 2006 Ford F-150
  • On your 2006 Ford F-150 there should be fuses and relays used for the tow package wiring. Since the trailer lights do not work but the brakes do, it does sound like a fuse or relay problem. Under the hood, the #10 fuse is for trailer tow backup lamps and parking lamps. Fuse #36 is trailer tow right turn/brake lights. And #42 is trailer tow left turn/brake lights. Location #106 is for the 12 volt circuit to the trailer connector. For relays #R05 is the 12 volt circuit relay. Location...
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  • Correct Wiring Harness for 2013 Lexes FWD RX 350 w/ Tow Package
  • Both will work fine actually, the Curt Harness part # 56083 has been confirmed to fit by Curt on your 2013 Lexus RX-350 and we had a customer try the # 118252 on a 2013 model and it worked for him as well. If you look at the grey connectors on both of the harnesses you will see that they are the exact same.
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  • Best Trailer Connector Options for 2011 Chrysler 200 Convertible
  • The Curt # C56134 was discontinued and replaced by the # C56211. We no longer offer the C56134 and it's no longer available from Curt. If your trailer lighting is minimal, with two stop/turn/running lamps on the rear, or is LEDs, you could save some bucks and go with the Tow Ready # 118550. Once the # C56211 or the # 118550 was installed, you'll have a functional 4-pole trailer connector which is all you'll need to tow a trailer with basic lighting circuits. Either connector will plug...
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  • Trailer Hitch and Wiring for a 2007 Toyota FJ Cruiser
  • OEM is original equipment manufacturer, so the OEM hitch and wiring for a 2007 Toyota FJ Cruiser would be made/sold by Toyota. We do have hitches and wiring that will fit the 2007 FJ Cruiser at a fraction of the cost of OEM parts or dealer parts but they are not branded Toyota. The most popular hitch for the 2007 FJ is # 87412. This is a Class III hitch rated for 500 pounds tongue weight and 5,000 pounds gross trailer weight. There is no drilling required for installation. None of the...
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  • Adding 7-Way Trailer Connector to 1997 Winnebago Built on a Ford E-350 Van Chassis
  • If the 1997 Winnebago on the Ford E-350 chassis did not come with a factory trailer connector then in order to install a 7-Way you will need to first add a 4-Way. It is possible though that the T-connectors such as # 118344 for the 1997 Ford E-350 will not fit the RV body if it uses different lights than the regular E-350 vans. If it does have alternate lights then you would need a hardwire 4-Way, # 18252. This is if the vehicle has the brake lights and turn signals on the same bulb....
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  • Trailer Wiring Recommendation for a 2015 Subaru WRX
  • I was able to track down the product review where a customer said he used the Tow Ready Wiring harness part # 119147 on a 2015 Subaru WRX and it worked well. However, since Tow Ready hasn't officially listed your vehicle as a fit for this wiring harness I cannot safely recommend it for you. I would wait till they release information on whether or not this harness has been confirmed to fit your vehicle.
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  • 2014 Mercedes Benz GLK 250 Bluetec Wiring Harness Recommendation
  • Although they are not specific to your 2014 Mercedes GLK-250 BlueTec I did attach a set of installation instructions for the Curt Wiring Harness part # C56190 that you referenced to the right that will give you a good idea on how to install it on your vehicle.
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  • Troubleshooting Trailer Stop/Turn Signals that Work Intermittently
  • Sounds like a ground problem on the trailer. 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 a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of...
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  • Trailer Brake and Turn Signals Not Working when Connected to 2014 Hyundai Santa Fe
  • The wiring harness # C56184 for your 2014 Hyundai Santa Fe would not work or would not work properly if it is not grounded correctly. It needs to be grounded to a clean and corrosion free bare metal surface. No paint or coating. And it would be best if grounded by itself and not with other electrical device grounds. There are some easy ways to test the vehicle side 4-Way to determine if it is the problem. I have included a link to the right to our help article that will help you. It...
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  • Trailer with Incandescent Lights Hyper Flash when Connected to 2012 Mercedes GL450
  • That is unusual behavior for incandescent lights. It might be a result of a burned out bulb, either on the trailer or the vehicle, because that is the only time I have heard of hyper flashing with incandescent lights. Usually on German vehicles such as your 2012 Mercedes GL450 there can be issues if the trailer has LED lights because the LED lights do not draw enough power and it confuses the vehicle. The fix is to add more load by using a special adapter, which it sounds like you are...
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  • Gooseneck Fifth Wheel 7-Way Wiring Recommendation for a 2010 Ford F-150
  • It sounds like you are looking for a 7-way harness you can install in the bed of your 2010 Ford F150 for a gooseneck or fifth wheel trailer. Instead of the # 118261 you would want the part # 41157 as this is confirmed to fit your vehicle and will allow you to install a 7-way in the bed of your truck.
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  • Trailer Wiring 4-Way Harness Recommendation for a 2014 Ford Focus
  • The Tow Ready Custom Fit Vehicle Wiring # 118548 that you referenced can install on your 2014 Ford Focus without voiding the warranty of the vehicle. The connectors will plug inline with the taillight harness of your vehicle and will provide you with a 4-way for trailer taillights. I attached a set of installation instructions to the right for you to check out as well. For a hitch I would recommend the Draw Tite Hitch part # 24872, ball mount # 3593, 1-7/8 inch ball # 19256, 2 inch...
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  • Parts Needed to Install a 7-Way on a 2014 Dodge Grand Caravan
  • The only way you are going to be able to install a 4-way on your 2014 Dodge Grand Caravan is to first start with a 4-way. For that I would recommend the Curt Harness part # C56150. Now depending on your trailer setup you have two option for converting that to a 7-way. If your trailer does not have brakes all you would need is the part # 37185 to convert the 4-way to a 7-way. Now if you trailer does have brakes you will instead need the part # ETBC7 and a brake controller. For a brake...
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