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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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I installed it today and it went very well. Thank you for your prompt response and very fast shipping. I am really pleased. I hope I will be able to do business with you again.

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Le Sueur, MN





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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








Articles about Custom Fit Vehicle Wiring



Custom Fit Vehicle Wiring Questions and Answers

  • Can 5th Wheel/Gooseneck Trailer Wiring be Installed in the Bed of a 2014 Ram 2500 with Ram Box
  • I actually recommend 5th wheel/gooseneck harness # 41157 since it is already assembled. You could install it in the bed of a 2014 Tam 2500 with the Ram Box feature. You would just need to install it closer to the end of the bed (unless the Ram Box extends back that far). Otherwise it would have to be installed in the Ram Box so that the wiring when through the box, down, and over to he factory 7-Way. We haven't performed an installation on a model with the Ram Box feature since there...
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  • 4-Way Vehicle Side Trailer Connector that Can be Spliced Into Wires from Trailer Wiring Harness
  • I have a great option for you. Take a look at the Hopkins Quick Fix connector # HM48190. All you have to do is remove the screws on this connector, place the wires in the correct locations, and then put the cover and screws back on. The white wire will go to the one exposed pin. Next to it will be the brown wire, then the yellow wire, and the green wire is last. This connector also has a handy LED test light feature so you can see if each function has power without using a meter or circuit...
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  • Trailer Wiring Harness for 2008 Audi Q7
  • If your 2008 Audi Q7 did not come with a trailer connector from the factory you can use the Curt universal-fit wiring harness # C56200KIT which is shown in the linked video being installed in an Audi Q5. The written instructions are also linked. Installation of this or any wiring harness will be simplified by use of a circuit tester such as # 40376 or # 3808 to confirm the function carried by each vehicle wire before making connections to the harness. The linked video illustrates use...
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  • Should the Trailer Hitch or Trailer Wiring be Installed First on a 2014 Dodge Journey
  • Installing the wiring harness # 118536 first on your 2014 Dodge Journey could make it easier. This is because you will need to route a connector from the left side of the vehicle to the right side. The hitch could potentially get in the way. Take a look at the video I have linked showing installation of the wiring on a Journey. Notice that the hitch is installed in this video and it wasn't really in the way. Ultimately I don't think it is going to matter which you install first. You...
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  • Trailer Wiring Harness for a 2007 Kia Sedona
  • Even though you ordered a hardwire harness # 56146KIT it would still work on your 2007 Kia Sedona. You would just have to use a circuit tester, included with the kit, to test the tail light wires, and then attach the wiring harness wires accordingly. But there are T-connector wiring harnesses for your vehicle. You could use # 118410 which plugs in line with the vehicle tail light wiring. To testing required. But you will need to make a direct connection to the vehicle battery. This...
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  • Installed 7-Way and 2012 Jeep Grand Cherokee Dealer Reprogrammed But No Brake Lights/Turn Signals
  • If your 2012 Jeep Grand Cherokee did not come with a factory installed 7-Way then if you plug one into the wiring at the back of the Jeep the 7-Way would not function. Like you already did, you would go to the dealer and have them reprogram the computer to get the newly installed 7-Way to function. If everything was installed properly then it should work. If not then they may have made a mistake in the reprogramming process. Or, it could be that there is a fuses or fuses or even relays...
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  • Trailer Wiring Harness for a 2014 Hyundai Sonata GLS
  • We do have a wiring harness that will fit your 2014 Hyundai Sonata GLS but # 118557 is not yet a confirmed fit. I checked with Curt and you can use harness # C56049. I have included a link to the installation instructions for you.
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  • How to Use Quick Splice Connectors or 3M Scotchloks and Wiring Harness for 2014 Dodge ProMaster 3500
  • To use the quick splice connectors you will put the wire you want to splice into on the inside track of the connector. Then put the wire from the wiring harness # C56190 in the track next to it. Close the plastic clip and use some pliers to squeeze the connector to make the splice. I have included a link to a video that shows our installer using the connectors. Go to about the 56 second mark to see it in action. But if you have a 2014 Dodge ProMaster 3500 you could just use # C56209....
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  • 6-Way to 4-Way Trailer Adapter Does Not Work with 6-Way Connector on 2004 Jeep Grand Cherokee
  • If there are only 5 wires at the vehicle side connector, then that could affect the Tow Ready T-One Harness, # 118369. We have not heard of any problems with this harness and the Jeep Grand Cherokee, so I recommend using a circuit tester, like part # 40376, to test the pins on the vehicle side connector for the appropriate functions. You should have one pin for each of the following functions ground, left turn signal, right turn signal, running lights, brake lights and constant 12v power....
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  • Problem With 7-Way Socket for 5th Wheel on 2011 GMC Sierra
  • It seems odd that one pin on your Sierra's 5th wheel 7-way socket would repeatedly come loose after use. I suspect there may be a problem with the male plug end on your trailer. Perhaps that contact is bent, corroded or otherwise damaged in such as way that it grabs hold of the ground contact in the truck socket when removed. I would carefully inspect the trailer's male plug contacts for any signs of damage that could cause it to pull out the ground contact. If you need a replacement...
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  • 4-Way Trailer Connector Mounting Bracket for Tow Ready Wiring Harness on a 2014 Honda Pilot
  • It sounds like you have Tow Ready harness # 118558 on your 2014 Honda Pilot. For a 4-Way mounting bracket there are some options. You can using bracket # 18144 with either long bracket # 18136 or short bracket # 18140. You could also use something as simple as # 118149 or magnetic mount # 38095.
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  • Installing a 7-Way Trailer Connector on a 2013 Ford E-250 Van
  • I checked with Tow Ready about 7-Way connector # 118261 and it is not a confirmed fit for the 2013 Ford E-250 van. Since there are no other options and since you have some factory wiring already, I recommend using 4 and 7-Way connector # HM40975 with harness # PK11998. You will need to test the wiring on the vehicle end with a circuit tester such as # 3808 to determine the functions. Then you can install the harness accordingly: Red - Left Turn and Stop White - Ground Blue - Electric...
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  • How to Determine the Towing Capacity of a Vehicle
  • Basically you will look in the vehicle owners manual for the towing capacities of that vehicle. Also there should be listed a gross combined weight rating. This is the maximum that the vehicle and trailer can weigh together and includes cargo, passengers, fuel and anything else in the vehicle and trailer. Stay within the towing capacity and stay within the gross combined weight rating and you will be fine. If you do not know how much the trailer weighs you can take it, loaded and...
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  • Curt Trailer Wiring Harness # 56146KIT Malfunction in 2003 Mercedes-Benz M-Class
  • Thank you for your purchases from etrailer. Based on your troubleshooting and testing efforts it does sound like the Curt converter # 56146KIT you have could be bad. Correct signals in but incorrect signals out usually means the converter is damaged. The exception is if your trailer uses super-efficient LED-type lights. These will often illuminate when standard bulbs do not simply from the small residual current that passes through the converter. If not I suggest you carefully check...
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  • Where Does Curt Trailer Wiring Harness Install on a 2014 Toyota RAV4
  • The T-connectors are the ones on the harness # C56166 since they Tee into the vehicle wiring. Find the wiring to the tail lights on your 2014 Toyota RAV4. There will be a connector that you will unplug. Then plug the forward connector into the matching input on the harness, and the output from the harness back into the connector that leads to the tail light. We do not have a video for that particular harness but we do have one on another harness that fits your RAV4 which I have linked...
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  • Trailer Wiring Harness Recommendation for a 2005 Chevy Equinox
  • There are a couple of options for trailer wiring harnesses that fit your 2005 Chevy Equinox. I have included a link to the right to them for you. The prices are also listed. Out of the options I recommend # 118391. It is the more popular option, cost less, and works well. I have linked a video showing how it installs on a 2005 Equinox for you.
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  • Recommended Wiring Harness For 2008 Jeep Liberty
  • The question box was not populated but it looks like you may be interested in wiring for your 2008 Jeep Liberty. If you have the factory 7-way connector on the rear of your Liberty, You may be interested in the T-One Vehicle Wiring Harness, part # 118381, to give you a 4-way connector. I have attached a link to a product review video for this harness you can check out. If you do not have the connector on the rear of your Jeep, I recommend the Tow Ready Custom Fit Vehicle Wiring,...
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  • Is Computer Reprogramming Required to Install Curt Trailer Wiring on a 2013 Audi Q5
  • I spoke to my contact at Curt and he informed me that you would not need to reprogram or reflash the vehicle computer to install the Curt Wiring Harness part # 56200.
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  • How to Install Hopkins Hardwire Trailer Wiring Harness on a 2010 Dodge Grand Caravan
  • There are no vehicle specific instructions for wiring harness # HM48895 because it is a universal hardwire type of harness that fits many vehicles. Basically you will use a circuit tester such as # 3808 to test the vehicle tail light wiring. Once you know what the wires do on the vehicle you can splice them into the harness. On this harness, the white wire is ground and attaches to a clean bare metal surface. Brown is for running lights, yellow is left turn signal, red is brake lights....
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  • 7-Way Wiring Harness for 2001 Ford Expedition
  • If your 2001 Ford Expedition has a rectangular plug like the one shown in the linked photo then it is likely that the vehicle was factory wired for a 4-pole connector. In order to convert to a 7-way you'll first need to have a 4-pole on the vehicle. You can use Curt part # C55250. To this you can then add adapter part # 37185 from Hopkins, which is a 7-way that plugs into the 4-pole. It includes a mounting bracket. Once installed the Hopkins adapter will carry lighting signals for your...
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