7 way trailer rv plug diagram this guide is here to help you if you can not figure out your wiring even after reading this guide then contact your local mechanic or trailer shop for help if you are local to us give us a call if you want to schedule a time to have your trailer fixed. 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. When wiring a trailer connector it is best to wire by function as wire colors can vary we have an excellent wiring diagram on our website i will provide you a link so you can look at it if you are looking at the inside of the trailer connector where the wires mount to the terminals starting at the notch at the top and working clockwise. Trailer electrical connectors come in a variety of shapes and sizes the basic purpose remains the same whether your truck and trailer is using a 4 way 5 way 6 way or 7 way connector by law trailer lighting must be connected into the tow vehicles wiring system to provide trailer running lights turn signals and brake lights. Basics 7 way connector 7 way connectors allow for all functions provided by 6 way connectors three basic lighting functions electric brakes and additional power supply with the seventh wire for backup lights basically it is another 12v circuit typically used for a reverse light reverse lockout for trailer brakes
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