Locating Factory Brake Controller Harness on 2017 MB Thor Motorhome

Updated 01/08/2018 | Published 01/06/2018

Question:

2017 MB 3500 thor motorhome, has factory wiring for trailer, and has wires for brakes, at the connection, cant find where to install brake controller wire, not under seat. all utube show

asked by: Larry B

Expert Reply:

If your 2016 Mercedes-Benz Sprinter 3500 chassis has a factory brake controller connector, it should be located under the driver's side and will be a green connector. If you cannot find the harness under the seat, then it is likely that there is not a built-in harness and your brake controller will simply need to be hardwired.

If there is not a harness on the vehicle, then I recommend adding the Wiring Kit # 5506 to help complete the installation. I have attached a couple of articles on trailer brake controllers that you might also find helpful.

expert reply by: Chris R