Gm Truck 7 Pin Trailer Wiring Diagram. I found that the white (ground) wire from the four way flat was cut short inside the seven way shell, and only the fat white external. Trailer Wiring Diagram - Wiring Diagrams For Trailers Trailer electrical connectors come in a variety of shapes and sizes.
Also I checked the digital manual in the truck (scan for hitch power) it says nothing much other than " a qualified mb tech will give you more information". Regardless of wire color, the pin position for function is pretty standard. I found that the white (ground) wire from the four way flat was cut short inside the seven way shell, and only the fat white external.
Is the OEM Trailer Wiring Pattern the Same for Dodge Ford and GM vehicles Question: It has been proposed to me that there is a possible difference in the wiring pattern on a seven contact trailer connection on Dodge trucks and GM trucks and Ford.
Regardless of wire color, the pin position for function is pretty standard.
This diagram shows the colors of a basic trailer wiring setup as well as what each wire is supposed to be connected to. I found that the white (ground) wire from the four way flat was cut short inside the seven way shell, and only the fat white external. I mounted the lights, but am not sure how to properly wire them up.