2002 Dodge Ram Pickup Trailer Wiring | etrailer Call 800-298-8924 to get Expert Service ordering a Trailer Wiring for your 2002 Dodge Ram Pickup. Complete installation instructions and lifetime technical support on all Trailer Wiring purchases. Lowest price guarantee on accessories for your Dodge Ram Pickup and the fastest shipping available. Installing a Brake Controller on a 2002 Dodge Ram 1500 Installing a Brake Controller on a 2002 Dodge Ram 1500 Equipped with a Factory 4-Way P3 is a proportional brake controller which means it senses how the tow vehicle is slowing or stopping and applies the trailer's brakes with the same intensity. It also has a full display screen instead of codes that need deciphering.