Round 4 Pin Trailer Plug Wiring Diagram

Round 4 Pin Trailer Plug 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.

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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. Not sure which wires attach to what on your trailer connectors?

What is the best way to do this?

Not sure which wires attach to what on your trailer connectors?

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Trailer Wiring Diagrams showing you the typical wiring for most single axle trailer and tandem axle trailers. Wiring your four-pin trailer can be a challenge when you first do it, but it's a simple do-it-yourself task. Here's the wiring diagrams showing the pin out for the plug and socket for the most common circle and rectangle trailer connections in use in Australia.