Trailer Wiring Diagram – Lights, Brakes, Routing, Wires ...
Expanded Use Trailer + with Brakes, Aux Power & Back-up Lights = 7-Pin Connector. (6-Pin Connectors also exist, but they are less common.) (6-Pin Connectors also exist, but they are less common.) 1-4 Wire the first 4 pins just like above, and the 5th line goes to the brakes.
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