4 Way Flat 4Pin 3feet/36 inch Trailer Light Male Plug Wire Harness/Connector. Trailer Light Wiring Harness 4-Pin Flat Wire Connector. Designed For Use On Vehicles And Trailers w/Two-Wire Systems. Trailer Wiring Color Connection Guide: Green-Right Turn, Yellow-Left Turn, White-Ground, Brown-Tail/Marker . Total Length: about 38" Wire Length: about 37" Wire: 18 gauge