Posted by gchuba on 08/19/17 - 9:44 PM
#2
White should be positive. Yellow is being used for dc negative/ground. They have trailer wiring guides that are color coded. Black was being phased out as negative because of confusion with ac wiring. Black being replaced with yellow. For trailers sometimes the negative is the chassis. The chassis then has to be connected to the ground (or negative battery terminal) of the vehicle.