Brake Controller Turning On Brake Lights When Car is off and Draining Car Battery

Expert Reply:

It sounds like the unit was wired incorrectly. The white wire is a ground wire, and should be connected to a suitable ground connection on the vehicle. The blue wire is the output wire that sends power to the trailer brakes when they need to activated. The red wire should be connected to a stop light circuit. Typically this is connected to one of the brake light switch wires at the top of your vehicle brake pedal. The black wire should be connected directly to the vehicle battery for a power source.

It seems like the the red wire is connected to an incorrect wire as well as the blue wire. Use a circuit tester, like part # 3808, to find out what wires your brake controller is currently connected to and which wires it should be connected to. I have also added a link to the instructions for this brake controller.

expert reply by: Patrick B