I am trying to hook up the third-break light on a camper I recently put on my truck. I know that I need to splice into one of the three wires that are going into the break light on my truck, but I don't know which one...
There is a green wire, a green wire w/ a red stripe, and a black/white wire going into the break light.
Which of these is the wire that controls the break light... NOT the running light? I only want the third light to come on when I press the brake.