Wireing Diagram For A Class 8 Trailer. Rewiring a trailer involves removing the old wiring and trailer lights, routing the new wiring harness through the trailer frame When it's time to install the new trailer wiring and rewire trailer lights, you can reference this sketch as a guide. It shows how the electrical wires are interconnected and can also show where fixtures and components may be connected to the system.
I sure hope some one can help.
The negative ground point in a vehicle is the frame/chassis, so for a trailer it would likely be the metal.
Heavy duty trailer had a total failure of all lights, brake lights, running and turn signal. I have enclose a picture of what I do have. Trailer wiring diagrams are available for most commercial trailers.





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