Finding The Cold Side Of The Brake Light Switch In A 2016 MBS Motorhome
Published 01/31/2024
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Question:
I have a 2016 MBS motor home with 7 pin rv plug from the factory but there is no green brake controller plug under the drivers seat. Is it safe to pickup brake light signal from the brake switch? The wires on the switch are very small gauge. do you have wiring schematics for this vehicle? Thanks for your time, always appriciated
asked by: Mike Y
Expert Reply:
Yes, the cold side of the brake light switch would be where you would need to splice into for the braking signal. While we don't have wiring schematics for your motorhome I do still have two options for getting the signal.
Option 1: You can use a hook & probe tester # PTW2993 and check each wire coming from the brake pedal until you find the one that only has power while the brake pedal is depressed.
Option 2: You can install the Roadmaster Universal Stop Light Switch Kit # RM-751000. This sensor mounts to the brake pedal and activates when the brake pedal is depressed, sending the signal out to the brake controller to activate the brakes.
I personally prefer Option 2 because I've had to look for the cold side of the brake switch many times and it's a hassle getting under the dash and trying to poke into super thin gauge wire. You could also try reaching out to Mercedes to see if they would know the color of the brake light switch wire as well. If you do tap into it I recommend using some quick splices due to the thin wire gauge.
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