How Does Monitor Light for Roadmaster Invisibrake Wire to Towed Vehicle

Question:

RM-8700 install, installing the motorhome monitor LED. Watched the video on the Mercedes sprinter install and there was blue wire to attach the monitor LED. My sprinter does not have that extra blue wire. Can you tell me where can I connect the monitor LED wire in my 2016 Mercedes 3500 sprinter. Thanks

asked by: Ed S

Expert Reply:

I attached a diagram that shows how the monitor wire gets installed with the Roadmaster Inivibrake part # RM-8700. Since you don't have the same blue wire you'll need to use a circuit tester like part # PTW2993 to test all of the wires that are at the stoplight circuit switch to find the one that has 12 volts when the brakes are applied. That will be the circuit to use.

expert reply by: Jameson C