7 Pin Dump Trailer Wiring Diagram. The top countries of supplier is China, from. Regardless of wire color, the pin position for function is pretty standard.
Look at the wiring diagram for your truck and determine the designation given to the ground location for the taillights. Regardless of wire color, the pin position for function is pretty standard. I called MB and asked for the original hitch harness.
I found a diagram on the web (see attached), but can't tell if the diagram is from the front or rear of the connector - ie if you unplugged it at looked at the side that mates with.
On trailers that have their own battery supply (travel trailers, dump trailers, etc).
I called MB and asked for the original hitch harness. Single Pole Light Switch Wiring Diagram. Use this as a reference when working on your boat trailer wiring.