6 Way Trailer Brake Wiring. Current trailer wiring systems can come in several varieties. As the name implies, they use four wires to carry out the vital lighting functions.
As the name implies, they use four wires to carry out the vital lighting functions. Industry standard wiring configurations and color codes. The dealer I bought it from said it used to have a trailer brake installed and I was just assuming that was the case, but now I'm not so sure.
It's designed that way so that any screw up in your trailer wiring or any shorts in your trailer will not affect the truck turn signals.
Trailers are required to have at least running lights, turn signals and brake lights.
The gray wire for trailer battery charging and the red/wht wire for the back up lights. I pulled the engine compartment fuse. If done in a modular fashion, it isn't too.