4 Post Trailer Wiring Diagram. The first step in wiring your trailer cables is to ground the white cable first. It gets complicated when you have trailers with more cables, and in this case, you need an adapter to make the connections.
Not sure which wires attach to what on your trailer connectors?
This is a short video series of the steps that I have taken to refurbish and old Utility Trailer that was designed and built by my father.
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I had quicker luck with a meter than locating a wiring schematic. This page has wire diagrams for many electric options including wires for trailer lights, brakes, alt power and connectors. So anyone have a diagram, or just know the color/functions?