SeaChoice 4-Way Wishbone Style Trailer Wiring Harnesses - Wire descriptions: White - ground (21 Gauge), Brown - tail lamps (19 Gauge), Yellow - driver side stop/turn (19 Gauge), Green - passenger side stop/turn (19 Gauge). The Seachoice 4-Way Wishbone Style Trailer Wiring Harnesses also include a 4ft trunk connector.