Brake Controller Wiring on a 2008 Jeep Liberty With Factory Class III Trailer Package

Expert Reply:

The Class III trailer package on the Jeep Liberty comes with a 7-way connector at the rear of the vehicle.

To install a brake controller on your 2008 Jeep Liberty with a factory 7-Way you will need to hardwire the wires from the back of the brake controller to the vehicle. This vehicle does not have a brake controller port that you can plug the brake controller into.

The four wires on the back of the brake controller are:

White: Ground, attached to the vehicles negative battery terminal.
Black: 12v power lead, attached to the positive battery terminal with a 20 amp or 30 amp circuit breaker. Use the 20 amp breaker kit, part # 5505, if your trailer will typically only have 1 to 2 sets of brakes, or use the 30 amp breaker kit, part # 5506, if your trailer has 3 to 4 sets.
Blue: Electric brakes, attached to the blue electric brake wire on the 7-Way connector at the rear of the vehicle.
Red: Stoplight switch, normally located directly off the vehicle's brake pedal. Attach to the wire on the switch that only has a signal when the brake pedal is pressed.

I am including a link to a FAQ page on brake controller wiring.

Also, if you have a factory 7-way connector at the rear of your Jeep then you will want to look for a blue (brake controller) wire to be stored up under the drivers side of the dash. It will be taped to the back of another wiring harness. You will run the blue brake output wire from your brake controller to this wire.

If you need a brake controller I would recommend the Tekonsha Prodigy P2 Brake Controller, part # 90885. This is our best selling brake controller. I am including a link to the instructions on the Prodigy P2 brake controller.

expert reply by: Bobbi