Power Distribution Box - Ford F-350 Owner's Manual

Power distribution box

The power distribution box is located in the engine compartment. The
power distribution box contains high-current fuses that protect your
vehicle's main electrical systems from overloads.
Always disconnect the battery before servicing high current
fuses.
To reduce risk of electrical shock, always replace the cover to
the Power Distribution Box before reconnecting the battery or
refilling fluid reservoirs.
If the battery has been disconnected and reconnected, refer to the
Battery section of the Maintenance and Specifications chapter.
The high-current fuses are coded as follows:
Fuse/Relay Fuse Amp
Location
1
2
3
4
5
2008 F-250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA (fus)
Roadside Emergencies
Power Distribution Box
Rating
Relay Blower motor/Variable blower
control (Dual Zone Climate Control)
Relay Electronic Shift-on-the-Fly (ESOF)
Lo-Hi
Relay Heater mirror
— Not used
30A* Trailer Brake Controller (TBC)
Description
303