Is there a Brake Controller Wiring Harness that Plugs into a 2007 Mercedes ML500

Question:

Mercedes ML500 with factory tow package. So, it has a 7 way receptacle and receiver hitch, question is does it have a connector under the dash to plug in a brake controller. If so, which adapter cable works for this vehicle.

asked by: Greg M

Helpful Expert Reply:

A brake controller wiring harness is not available for the 2007 Mercedes ML500. It is possible that Mercedes has a harness if the vehicle does indeed have a port to plug one in. That would be obtainable at a Mercedes dealer.

Usually, with factory harnesses, there are more than just 4 wires, which is what brake controllers have. The brake controller wire functions are white for ground, black for 12 volt power in, red for input from the brake switch, and blue for output to the trailer brakes. If Mercedes does have a harness then you should be able to splice the brake controller wiring in accordingly.

If a Mercedes dealer does not have an option you will need to hardwire the controller using an installation kit # 5506. Then you will follow the relevant parts of the instructions I have linked to the right.

expert reply by: Michael H