F 350 4WD Pickup V8-351 5.8L VIN H EFI (1997)
Trailer Lamps: Description and Operation
Vehicles equipped with the trailer towing package have the additions to support the trailer wiring:
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A set of relays in the engine compartment and connector on the rear lamp wiring, located in the rear bumper area.
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Trailer feed wiring is supplied with the vehicle and installed at the time of pre-delivery.
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Vehicles are equipped with a wiring feed, located under the instrument panel, for a trailer brake control unit.