Trailer Wiring Color Code This chart is a typical guide, wire co lors may vary based on manufacturers. Use a circuit tester to verify connections. Suggested wldilligin:un;e Where To Where To Connector Function Color 4 W 6 W--- Attach - Attach - Trailer BY av Vehicle Side Side & 5 & 7 Way . Way Mm"4 WWWMW? L'"'"""" ML-e tu tn 0 ' . , Left Turn Yellow 18 16 vehicles wiring {FEELS 13? harness urn srgna 4 We Vehicle ground Vehicle ground 5 y . point - metal, point - metal, Way Ground Whe 16 12 uncoated, uncoated, 6 rustproof rustproof 7 rs, Way