Brake Controller Wiring Installation in 2012 GMC Terrain  

Question:

Expert Reply:

The vehicle wire that needs to connect to the brake controller's red input signal wire is the one that goes to the cold side (load side) of the brake light switch. This is the wire that goes hot only when you press on the brake pedal but at no other time. A circuit tester like # PTW2993 will let you test to find this wire.

The remaining three wires from the controller connect as follows: the WHITE ground wire connects to battery ground terminal; the BLACK 12V power wire connects to the battery positive post through a circuit breaker like # PK54520; and the BLUE output wire connects to the 7-way for the trailer's brakes.

You may care to check out the linked article that covers the process of brake controller installation.

expert reply by: Adam R

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