What are the wire colors on trailer wiring connectors?

Trailer Feed (Blue Wire): This is the wire that supplies brake power for the controller to the 6-way or 7-way trailer connector at the back of the vehicle. Some vehicles with factory tow packages already have this wire run from under the dash to the rear of the vehicle. If it does not have this, the wire will need to be run along the underside of the vehicle and through the firewall to the Brake Control mounting location. The blue wire is attached to the brake control on your vehicle side and the brake away switch on the trailer side.

Ground (White Wire): This wire is connected from the brake controller to the ground location.

Brake Switch (Red Wire): This can be found near the top of the brake pedal. The wire that has power when the brake pedal is pressed can be found using a circuit tester. This wire is attached to the fuse block or Fused battery lead on the vehicle side and attached the the break away kit, interior lights, and battery charger on the trailer side.

Battery Power (Black Wire): This is the connection that supplies power to the brake controller. Some vehicles with factory tow packages already have this wire run from under the dash to the battery with some kind of circuit protection.

Right Turn (Green Wire): This is the wire that supplies the right turn signal on your vehicle and trailer. This is attached on the right turn of vehicle's wiring harnesss, and trailer right turn signal.

Left Turn (Yellow Wire): This is the wire that supplied the left turn signal on your vehicle and trailer. This is attached on the left turn of vehicle's wiring harness and trailer left turn signal.

Tail/Marker (Brown Wire): This is the wire that supplies your tailights and marker lights. This is attached to the tailight of vehicles wiring harness and trailer's tailights.

Back Up (Purple Wire): This is the wire that provides auxilary power to your back up lights. This is attached to the back up circuit of vehicles wiring harness, and back up lights (if available) or hydraulic coupler on your trailer.

Wire colors may vary based on manufacturers. Use a circuit tester to verify connections. Click on the link to view our article Wire Color by Manufacturer.