Large 7 Pin Trailer Plug Wiring Diagram. Determine which color wire supplies constant power to the ignition switch. 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.
The above are to Australian trailer wiring standards.
Driving with a large trailer can severely limit your rear view, so it's essential that your rig is equipped with a backup alarm.
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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. Trailer Plug Wiring Diagram - Free download as PDF File (.pdf), Text File (.txt) or read online for free.