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How to wire a trailer plug 7 pin diagrams shown. There is a standard method of wiring a 7 pin trailer connector if you dont follow this your trailer or tow vehicle cant be used with any other implement. Easy way to remember wiring of a 7 way rv plug rv standard duration 633 my rv works inc 76234 views 633 how to test 7 way trailer rv electrical plug duration 430 . 7 way plug wiring diagram standard wiring post purpose wire color tm park light green battery feed black rt right turn brake light brown lt left turn brake light red s trailer electric brakes blue gd ground white a accessory yellow this is the most common standard wiring scheme for rv plugs and the one used by major auto manufacturers today always test wires for function and wire . 7 pin n type trailer plug wiring diagram 7 pin trailer wiring diagram the 7 pin n type plug and socket is still the most common connector for towing this supplies power to the road lighting