bing tracking image

Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - 118650 Review

content loading

Products Featured in this Video

Review of Tekonsha Custom Fit Vehicle Wiring 118650

We're going to take a look at the T1 vehicle wiring harness with the four-way flat trailer connector. This is a custom fit part. It is designed to fit the 2007-2013 Dodge Sprinter, Freightline Sprinter, and Mercedes-Benz Sprinter 2500 and 3500 models. On a custom fit part I always like to recommend to go to our website and use our fit guide, put in your year and model vehicle and it will show if this works for your application. Now this harness will provide this four-way flat trailer connector for at the back of your vehicle to power your trailer signal light. It is compatible with 5 pull, 6 pull and 7 pull adapter that we sell separately. This does connect very quickly and easily. Basically, you just locate your connection points that are in the rear cargo area behind the taillights, plug in these T-connectors, one on each side, driver side and passenger side.

Ground your white wire then run your black power wire to your vehicle's battery. Now this does include this module-like power converter right here. This is to insure that your vehicle's wiring will match that of your trailer. It is a powered module. That's why you will have this black wire run to your battery and that's to avoid overloading your vehicle's electrical system. The wire that the four-ways attach to that will run out the back and plug into your trailer it is constructed of a 16 gauge bonded wire. The other nice features if you look on the four-way itself, it has this integrated dust cap on it which is nice when you're not plugged into your trailer, put your dust cap over your terminals and it protects them from any damage or from the elements.

A few specs on this harness: maximum amperage on the stop and turn light circuits is 5 amps per circuit; on the taillight circuit is 7.5 amps; this part includes everything laid out here on the table and I'm going to show you where each part pretty much goes. It does include this nice set of detailed instructions that will described how to install it and, if you notice, it also has pictures of where your installation points are. Basically, what you do is go to the rear of the vehicle and access your rear cargo area. You go behind the taillights and you want to start on the driver side. You'll take this T-connector with the yellow wire in it and you'll go behind the taillight and disconnect the harness, then plug this between the taillight and the wiring harness. Then you'll go to the passenger side and you'll have this green wire which has an extra length of wire. That will run all the way over to your passenger side.

You'll do the same over there behind the taillight. Plug this T-connector in. Once those are all connected your module light converter right here you do want to attach this to a nice flat surface so it doesn't bounce around. They do include a piece of double-face tape that will attach it down. There's a bracket here that you can put a screw in to hold it down or you can even use any of the cable ties if you need it. You do want to make sure it is attached to a nice flat surface so it doesn't move around.

Once that's done, you'll have these two wires left to connect. What you want to do is run your bonded wire out the back for your trailer. Then you'll have these two wires left to connect. The white wire if you'll notice has an eyelet on it. That's for your ground. You can connect this to a good clean ground that's nearby. If you need to make one, they do include a grounding screw that you can drill a hole and make your ground. The last wire will be the black power wire. Now that will need to run to your vehicle's battery at the front of the vehicle. They do give you this length of wire. What you want to do is take your included butt connector, put it on your power wire and then connect it to one end of this length of wire. Run this all the way up to the front of the vehicle to the battery. You don't want to connect this directly to the battery. You want to run it through this inline fuse holder. Take your other butt connector and put it on here and connect it to one end of your fuse holder. On the other end of your fuse holder they include this eyelet connector. Just put it on that and then this is what will connect to the battery. Once that's all connected, pop open your fuse holder, take your included 15 amp fuse, push it right in there, put your cap on there and now your system is all ready to go. Again, they include extra cable ties to take up any slack in the wiring or to attach anything down to keep it from moving around. That should do it for the review on the T1 vehicle wiring harness with the four-way flat trailer connector.

Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video Edited:
Joshua S
Employee Brent H
Test Fit:
Brent H

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.