Whats the positive side on a pigtail plug!!

Does anyone know how to connect a pigtail plug?...Which side is positive and which is negative? Does the A stand for positive or the B? I have to connect the reverse lock out and gm sold me a connection where both wires are the same color...Go figure..I guess they think we are all smart electricians!!

Doesn't really matter since the current isn't going to ground. You're simply feeding the circuit through a switch to open or close the circuit.