What are the Wiring Functions for Pigtail Wiring Harness # 7894

Question:

Could I get a wiring diagram for this wiring harness? I will install it on a 2003 Jeep Liberty.

asked by: Kevin T

Expert Reply:

The functions of the Pigtail Wiring Harness # 7894 are as follows:

White is ground
Black is 12-volt power
Blue is output to trailer brakes
Red is input from the brake switch

The brake switch is located above or may even be attached to the brake pedal. The wire you need on it should be a white/tan wire so test it first using a circuit tester such as # PTW2993. You will need the wire that only has power when the brake pedal is pressed. If it shows power with the headlights or turn signals on, then it is not the correct wire.

expert reply by: Michael H