Finding Cold Side of Brake Light Switch on 2004 GMC Sonoma
Question:
I am installing an electric trailer brake controller. What wire color wire is the cold side on the stoplight switch on a 2004 GMC Sonoma?
asked by: Wade
Expert Reply:
According to my research the cold side of the brake light switch behind the brake pedal on your 2004 GMC Sonoma is likely white in color. I still strongly recommend that you test the wires with a circuit tester like # PTW2993 to ensure you find the one that only gets power with the brake pedal depressed and no power with any other function.
You can simply start by testing the white wire to hopefully shorten up this process.
The cold side of the brake light switch will connect to the red wire on your Hopkins Agility Brake Controller # HM47294.
