5 Flat Trailer Wiring Diagram. Brown pin for side markers tail lamps and running lights. 7 pin flat the best.
Yellow pin for abandoned brake light and left. This type of connector is ideal for customer trailers. Brown pin for unwanted markers tail lamps and running lights.
A flat 4 plug for 4 wire trailers a flat 5 plug and a round 5 plug for 5 wire trailers.
Choose a connector that has the required number of pins for the functions. Heres the diagram for 7 pin connector. Here is the diagram for 7 pin connector. This trailer wiring diagram 5 way version is more suitable for sophisticated trailers and rvs.