What Are The Functions Of Standard 4-Pole Connector Wires?

Question:

I have White, Brown, Yellow, and Green wires on a 4 prong plug. I know the Brown wire is the Running lights, the Yellow wire and Green wire are Turn Signal, Flashers and Brake lights, But what does the White wire do?

asked by: Jim P

Expert Reply:

Whenever messing with wiring, I never go by the color only by function. Ideally the wires function and the colors are correct but sometimes that is not the case. Let's assume that the trailer wires are in their standard configuration on your wiring you're asking about # A10-6034VP. White is your ground wire, that is why there is a split. There is a ground to both sides. Brown is usually your taillights, yellow is your left turn/brake and the green is your right turn/brake signal.

expert reply by: Adam E