There are two types of 7-way trailer wiring connectors. One has flat pin and the other has round pins. The following schematic shows a Typical 7-Way Trailer Wiring Diagram. It should be noted that the center terminal is labeled as an auxiliary circuit but is most commonly used for backup lights not as a ground terminal as many try to use it.
7-Way Trailer Wiring Diagram
7-Way Trailer Wiring Diagram Color Code
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