Trailer Plug 7 Pin Wiring Diagram Australia. If you have a round connector, commiserations. A number of standards prevail in Australia for trailer connectors, the electrical connectors between vehicles and the trailers they tow that provide a means of control for the trailers.
Refer to your trailer service manual and plug installation instructions to avoid wiring problems that may damage your trailer, brake controller or vehicle!
You say that blue wire terminates in the engine compartment.
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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. Various styles of connectors are available with four to seven pins to allow transfer of power for the lighting as well. It can transfer electricity better compared to the connector is suggested for higher-level electric in the vehicle.