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Trailer wiring diagrams trailer wiring connectors various connectors are available from four to seven pins that allow for the transfer of power for the lighting as well as auxiliary functions such as an electric trailer brake controller backup lights or a 12v power supply for a winch or interior trailer lights choose a connector that has the required number of pins for the functions . 7 round trailer wiring diagram 7 blade round trailer plug wiring diagram 7 blade round trailer wiring diagram 7 pin large round trailer wiring diagram people understand that trailer is a car comprised of quite complicated mechanisms. How to wire a 7 pin large round trailer plug how to wire a 7 pin large round trailer plug skip navigation sign in search loading close this video is unavailable watch queue queue watch . The ground or battery negative return wire on the 4 pin side is not connected to the 7 way plug. 7 way rv trailer connector wiring diagram question trailer connector wireing diagram need to know which color wire go to which post asked by joann 0 expert reply 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