Australian Trailer Plug and Socket Pinout Wiring 7 pin 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. I put this here because I had a hard time finding and figuring this out for my trailers. If you have a round connector, commiserations. Get a flat one. Why? Well first of all, which round one? There are at least 3 different 7 pin round Trailer Wiring Diagram – Lights, Brakes, Routing, Wires Blue = Electric Brakes or Hydraulic Reverse Disable (See Blue Wire Notes below.) In the Trailer Wiring Diagram and Connector Application Chart below, use the first 5 pins, and ignore the rest. If your truck has a built-in 7-pin socket, but you only need 5 of the pins. Use the 7-pin connector anyway (see below), and just leave out the last 2 wires. Trailer Wiring Diagrams | etrailer Trailer Wiring Diagrams. 7-Way Round Vehicle Connector (Flat Pin) 7-Way Round Trailer Connector (Round Pin) A converter will reduce it to a standard 2-wire system needed for wiring a trailer. There are still additional wires for the running lights and for the ground.
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