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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.


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


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.


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

  • No Trailer Running Lights After Installing Tow Ready Replacement OEM Tow Package Wiring # 118267
  • The part you purchased (thank you), TowReady # 118267, is a replacement OEM harness for the Xterra that came with the factory 7-way. Although your Xterra did not come with the factory tow package sometimes the auto makers will still include certain components. It is possible that there are additional fuses that are not in place. Check for any fuse receptacles for 'running lights', 'trailer' or 'tow', and install any that are missing. You can use a circuit tester like the # 40376...
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  • Trailer Wiring Install on a 1998 Chevy Tracker that the Jack is Stored Under Passenger Seat
  • I spoke with a customer who has performed this installation and had to remove a panel forward of the jack compartment you mentioned. He stated that prior to removing the back drivers side jack compartment panel for access to the trailer wiring plug, he had to first remove the panel in front of it, by removing a few screws. The back side panel then is very carefully pulled out a bit at a time, to separate the panel from the side. Most of the inside panels are attached by inner snaps....
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  • Trailer Wiring Harness Recommendation for a 2006 Buick LaCrosse
  • The Tow Ready wiring harness part # 118479 is the correct wiring harness for your 2006 Buick LaCrosse. However, it does not have any circuit protection built into it. This is a custom harness designed to install easily on your vehicle but it does not have circuit protection. Tow Ready tested your vehicle and determined that circuit protections wasn't necessary. If you wanted a harness with circuit protection you would want the Tow Ready Custom Fit Vehicle Wiring # 119179KIT. This is...
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  • Trailer Wiring Harness 118496 Only has 4 Volts on Turn Signal Circuits on 2012 Toyota Tacoma
  • If you are only getting 4 volts on the output side of wiring harness # 118496 then there are a couple of things to check. First, check that the ground is attached to a clean and corrosion free bare metal surface. No paint or undercoating either. Also, it works best if it is grounded by itself and not with other items. If this does not help then you will want to test the converter. To do this use your meter to test the voltage going in the converter and then the voltage coming out. If...
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  • Trailer Running Lights Not Working with 2007 Nissan Armada
  • On your 2007 Nissan Armada, you may need an additional blue relay, # 38666-1, in the in-cab fuse panel to make everything fully functional. This will allow the running lights on the trailer to work. The in-cab fuse panel should be located under the dash to the left of a the steering column.
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  • Trailer Wiring Harness for First Half 1986 Model Year Nissan Pickup Trucks
  • It sounds like your 1986 Nissan Pickup was built in the first half of that model year life cycle. The harnesses for the 1986 , # 118353 and # C55353 both have converters and are for 1986.5 mid-year models. If your truck does not have separate turn signals and brake lights then neither of these harnesses will work. You would have to hardware in harness # 18252. I have linked a video that shows how you will need to test the wires, either at that round plug you mentioned or behind each...
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  • Availability of Twist-In Combination 7- and 4-Way Trailer Socket for 2012 GMC Sierra
  • We do not currently offer a twist-in combination 4-pole and 7-pole trailer socket for the OEM opening on your 2012 GMC Sierra. The likely reason no such item is offered is the limited space within the opening. We do have bracket-mount sockets with both 4-pole and 7-pole sockets, such as # HM40975 from Hopkins and # 20119 from TowReady. Both include the required hardware for installation.
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  • 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 Ram 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 does through the box, down, and over to the factory 7-Way. We haven't performed an installation on a model with the Ram Box feature since there...
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  • Where does the Connector of the Tow Ready Harness part # 118525 Install on a 2014 Nissan Frontier
  • If the connector you found on your 2014 Nissan Frontier has a red and a green wire coming out of it it sounds like you haven't found the correct connector yet. The correct one can be a little hard to find but it won't have any wires coming out of the front of it. Check out the video I attached that shows the Tow Ready Harness part # 118525 being installed in a similar Frontier as yours.
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  • Will the Curt T-Connector Vehicle Wiring Harness # 56097 have a 12 Volt Accessory Circuit Active
  • Yes, once you install the Curt T-Connector Vehicle Wiring Harness # 56097 the 12 volt accessory circuit would be activated which would allow you to install a RF Brake Controller part # 90250. I attached install videos for both products for you to check out.
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  • Troubleshooting Trailer Turn Signal/Brake Lights Not Working on a 2005 Nissan Titan
  • This does sound like a bad or missing relay. You can test the 7-Way connector without the trailer attached to see if you get any signal at all on the turn signal/brake light circuit with a circuit tester like part # 3808 (sounds like you already did this). The 2005 Nissan Titan should only need 2 relays out of the 3 that come with the Factory Style 7-Way and 4-Way Flat Vehicle End Trailer Connector, # N40975. You will want to consult your vehicle owners manual to determine where the...
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  • Can Trailer Wiring Harnesses Be Removed if the Vehicle will No Longer Tow
  • If you no longer have a use for trailer wiring you could definitely remove the trailer wiring converter box. Especially if it's making funny noises like it's shorting out. Try un-installing the trailer wiring harness and see if your taillight issues clear up.
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  • Trailer Wiring Recommendation for a 2014 Ford Fiesta Hatchback
  • Since the 2014 Ford Fiesta Hatchback has a different taillight setup than the Sedan model you would need to order a wiring harness with a converter built into it like the part # C56191 that you referenced. The # 56047 that you referenced would not be the correct kit for you.
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  • Troubleshooting Right Turn Stop Signal Not Functioning on a 2000 Ford F350 7-Way
  • The problem is somewhere between the 7-way connector and the wiring of your truck. You can try cleaning the pin on the inside of your 7-way. Corrosion or dirt on the pin can cause the circuit not to function. Even if it doesn't look that dirty try using some fine grit sandpaper to get the pin down to bare metal. Other places to check is the back of the 7-way. There might be corrosion there that needs to be cleaned. Also, check for exposed wire and fix as necessary. Aside from that you...
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  • Trailer Wiring Recommendation for a 2011 Toyota Highlander Hybrid
  • Yes, the Tow Ready Wiring Harness part # 118449 that you referenced will fit your 2011 Toyota Highlander Hybrid. The only difference on the Hybrid models is that you might need to track down a 10 amp mini-fuse for the underhood fuse install instead of the standard size fuse that is included with this kit. I attached an install video and installation instructions for you to check out.
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  • Trailer Wiring Harness Recommendation for a 2011 Malibu LTZ
  • Yes, the Tow Ready Wiring Harness part # 119179KIT that you referenced is confirmed to fit your 2011 Chevy Malibu LTZ. I attached installation instructions and an install video for this product for you to check out as well. The video shows a typical installation, the wire colors will be different for your vehicle.
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  • Trailer Wiring Harness Availability for a 2008 Lexus RX400h
  • Some vehicle manufacturers will run tow package wiring on the vehicles, but they will not include a trailer wiring harness if the vehicle is not ordered or purchased with the tow package. There is no aftermarket plug-in style trailer wiring harness for the 2008 Lexus RX400h. This may be a dealer only item if it exists. At this time, the only aftermarket wiring harnesses available for your vehicle are hard wire kits with a powered converter like part # 119190KIT. If you would prefer...
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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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  • Brake Controller Installation for a 1999 GMC Yukon
  • For your 1999 GMC Yukon to install a brake controller you will have to do a hard wire installation to connect your brake controller. Unfortunately there is not a quick connection port available on your year Yukon. If you already have a 4-way, you can then use the # ETBC7 to install a 7-way. If you need to establish a 4-way you can use # 189319. The brake controller installation will require you to splice into the correct wires on your Yukon, and if you don't already have one you will...
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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 will be the same no matter where the battery is. 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...
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