Trailer Pin Wiring. Learn all about trailer wiring at HowStuffWorks. 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.
T23490 7 Pin Trailer Wiring Connector N Type Aluminum Plug ... (Lulu Carson) Learn all about trailer wiring at HowStuffWorks. If you want to install a brake controller that's another issue wiring-wise, and there are threads here which cover that too. A previous owner has removed the connector at the rear and left two connecter jacks.
This is a basic reference article about trailer and caravan wiring; the plugs and sockets that are commonly in use in Australia, and the pin colour codes that are designed to coordinate proper.
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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. Cut the four-pin plug off of the trailer harness. If you don't follow this your trailer (or tow vehicle) can't be used with any other implement.