Auxiliary Switches

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

Customer Access (Upfitter) System

The auxiliary switch option package adds six switches to the overhead console. The switches are used by an upfitter to control relays for switching customer installed accessories. Each auxiliary switch has an indicator that illuminates when the switch is in the ON position. When the ignition is in the RUN or START state, the 6 auxiliary switches enable its corresponding upfitter relay in the upfitter relay box.

Upfitter relay box fuse F4 can be put into one of two positions. In Position A , auxiliary switch 5 and 6, operate with the ignition in RUN or START. In Position C , auxiliary switch 5 and 6 operate hot at all times.

Refer to Customer Access for schematic and connector information.

For accurate diagnostics of customer (upfitter) installed devices, it will be necessary to refer to the upfitter literature for information.

For more information, refer to the Owner's Literature and www.fleet.ford.com for truck body builder advisory service bulletins.