Trailer Towing Package Wiring

Vehicles equipped with the trailer towing package have the following additions to support the trailer wiring:

• A set of relays in engine control sensor wiring (12A581) (Bronco) or engine compartment (14A346) (F-Series) and connector on the rear lamp wiring (14405), located in the rear bumper area.
• The trailer feed wiring (13A576) is supplied with the vehicle and installed at the time of pre-delivery.
• Vehicles are equipped with a wiring feed, located under the instrument panel, for a trailer brake control unit.