Hopkins Brake Controller Does Not Activate Trailer Brakes with Brake Pedal on a 2008 GMC Sierra
Question:
I have hooked up my Hopkins Brake controller using an adapter harness to the wires under the dash. The red light does not come on unless you push the red button down. Power on red wire and blue wire if you push the button down but not brake pedal. Your thoughts?
asked by: Bob R
Expert Reply:
It sounds like you have the red wire on the brake controller connected in the wrong spot or to the wrong wire on the vehicle. The wires on the truck will not match up color for color to the brake controller wires. The tow package red wire connects to the black brake controller wire. Dark blue on truck goes to blue on the brake controller. Light blue on truck goes to red on the brake controller. And white will connect to white.
It is that light blue wire that carries the brake light signal to the brake controller. We actually have a very helpful FAQ article that I have linked for you. It will show you the wire attachments under the dash and also some additional connection that you may or may not need to make under the hood.
I have also included a link to a video showign a brake controller installation on a 2008 GMC Sierra.
