Mercedes Benz Sprinter 2500 Van Bulid Part 1 ( Trailer Hitch and Wiring )

Posted by Chi Ho on

Alright no tow vehicle is complete without a trailer hitch and wiring, so here's the first upgrade a brand new stereo unit !!!! Just kidding.. the trailer hitch was a super simple install, it was pretty much a direct bolt in without any drilling or cutting. It uses the stock bolt holes for the factory step bumper, there's four bolt total needed 3 from the factory bumper mounting and add an extra one that came with the trailer hitch kit.

The hitch model we ended up going with the for Sprinter was the Curt 13358, its a class III with Maximum gross trailer weight: 5,000 lbs and 7,500 when use with a weight distribution system. The hitch alone with the wiring harness was purchased from which was the best price shipped we could find.

Here is the finish product, it fit nicely under the factory step bumper, although we might need an extended ball mount but will report back when we do our first tow.

Up next the wiring for the trailer connector, the kit we got is made for the vehicle, so installation should be pretty straight forward, we will be installing a 7 pin round connector as well. How this harness kit works is, it adds a pigtail to the factory tail light harness, so there's no wire splicing needed. 

There's a access hole to the tail light from the inside of the vehicle without having to take the tail light off.

Although we would say the release clip to the tail light connector was a pain to get off without small hands. (there is one release clip on the top and one on the bottom)

Once is off just connect the trailer harness kit to it and plug the other into the factory tail light.

This is what it looks like when its connected.


Just do the same to the other side, the wiring is labeled left and right.

Secure the trailer harness module and attach the ground wire to the chassis.

Up next we had to drill a hole to pass the power wire and 4 pin trailer wiring to the under chassis.

Now connect run the power wire to the front of the vehicle connected to the battery with the included fuse-able links.

Since the harness kit was a flat 4 pin, we got a addition adapter with a 4 pin and 7 pin for all of our trailer needs. Just cut off the 4 pin connector and wire them to the adapter.

Zip tie all the lose wiring and its all done!!

A lot more interesting stuff coming in the next few weeks. Stay tuned :)




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