7 Flat Trailer Wiring. 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'll refer to wire color and gauge to make following along easier.
When authoritative reference information is located for other vehicle brands and model years. Trailer plug wiring is standardized across all vehicles, no point trying to find vehicle specific info. Learn all about trailer wiring testers at HowStuffWorks.
There used to be a "flat pin" and a "round pin" connector, but that has pretty much become a standard "flat pin" now, for.
Wiring for the plugs is more or less standardized.
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. Industry standard wiring configurations and color codes. This connection will provide the tail lights, stop lights and turn signal functions.