7 Pin Trailer Wiring Diagram. I put this here because I had a hard time finding and figuring this out for my trailers. Some trailers come with different connectors for cars and some have different wiring styles.
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.
Some trailers, like ones that carry cars or horses may have interior lights powered by the tow vehicle's battery. "Trailer Wiring for the Do-It-Yourselfer." trailerwiring.com.
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I hooked up to my trailer for the first time yesterday and no electric brakes. Seven-pin connectors are rarely used on trailers for local use. Anyone have a diagram of which pins supply which functions?