Trailer Wiring Color Code

Connector

Function

Color

Suggested Minimum Wire Gauge

wher To Attach - Vehicle Side

wher To Attach - Trailer Side

4 Way & 5 Way

6 Way & 7 Way

7 Way

6 Way

5 Way

4 Way

Right Turn

Green

18

16

Right turn of vehicle's wiring harness

Trailer's right turn signal

Left Turn

Yellow

18

16

Left turn of vehicle's wiring harness

Trailer's left turn signal

Ground

White

16

12

Vehicle ground point - metal, uncoated, rustproof

Trailer ground point - metal, uncoated, rustproof

Tail / Marker

Brown

18

16

Taillight of vehicle's wiring harness

Trailer's taillights

Brake

Blue

18

12

Electric brake control, power for brakes

Break away switch

Battery

Red (or Black)

12

Fuse block or FUSED battery Lead

Break away kit, interior lights and battery charger.

Back Up

Purple

16

Back up circuit of vehicle's wiring harness

Back up lights (if available) / Hydraulic coupler.

This chart is a typical guide, wire colors may vary based on manufacturers. Use a circuit tester to verify connections.