4 Wire Connector Diagram. The basic purpose remains the same whether your truck and trailer is using a 4 way 5 way 6 way or 7 way connector. Pin 1 pin 1.
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Installing your 4 pin trailer wiring system is easy if you follow the correct procedure.
Attach white ground wire to vehicle frame. It can transfer electricity better therefore the connector is recommended for higher level electric in the car. Connect the wires of the 4 wire trunk connector to the vehicle wiring. Here is the diagram for 7 pin connector.