Simple 4 Pin Trailer Wiring Diagram. Some trailers come with different connectors for cars and some have different wiring styles. It gets complicated when you have trailers with more cables, and in this case, you need an adapter to make the connections.
Trailer Plug Wiring Diagram - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Some trailers come with different connectors for cars and some have different wiring styles. Connectors are used between the two to allow disengagement when not towing.
This accounts for three of the colors in the wiring harness.
Connectors are used between the two to allow disengagement when not towing.
Trailer Wiring Diagrams showing you the typical wiring for most single axle trailer and tandem axle trailers. The first step in wiring your trailer cables is to ground the white cable first. There should be a common color for both the tail lights.