Flat Four Trailer Wiring Diagram. Small utility trailers light boat trailers little campers off road trailers and many more use this traditional 4 pin flat connector. It can transfer electricity better hence the connector is recommended for higher level electric in the car.
Green wires for any proper brake sign and right signal twist. White pin for the floor. White pin to your ground.
Read the complete rewiring guide for more.
It may transfer power better so the connector is recommended for higher level electric in the auto. On the other hand the diagram is a simplified variant of the arrangement. White cables for any electricity that occurs on the light. Yellow and green are for left and right turns and braking.