2008 Ford F-150 XI Fuse Box Diagram

Under the right-hand side of the instrument panel, in the passenger footwell: remove the trim panel, then pull the fuse box cover off by its PULL tab (to refit it, seat the top edge first and push the bottom until it clicks). Positions 1-42 are mini blade fuses, 101-118 are cartridge (JCase) fuses, 401 is a 30 A circuit breaker for the delayed accessory power for the power windows and power sliding backlite. Relays: R01 starter, R02 accessory delay, R03 high-beam headlamps, R04 heated backlite, R05 trailer tow battery charge, R06 blower motor (full ISO); R201 trailer tow park lamps, R202 fog lamps, R203 PCM (half ISO). Five further relays (R301 trailer tow back-up lamps, R303 fuel pump, R304 battery saver, R305 horn; R302 unused) sit on the circuit board inside the box and are not serviceable. The 2008 owner's guide draws this box a quarter turn clockwise (F01 at the top of the left-hand column, F22 at the top of the right-hand column); the drawing here keeps the 2004-2007 orientation of the same housing.

In the engine compartment on the left-hand fender: the larger housing fitted with the daytime running lamp (DRL) and 4x4 options. One fuse, F03, under the A/C clutch diode D01 at the top left; R202 A/C clutch relay and R201 DRL relay along the top; R01 4x4 counter-clockwise and R02 4x4 clockwise motor relays (full ISO) and R03 DRL high-beam disable relay (half ISO) along the bottom. D02 is the One Touch Integrated Start (OTIS) diode (from the late-2007 guide on).

In the engine compartment on the left-hand fender: the smaller housing fitted without the daytime running lamp (DRL) and 4x4 options. One fuse, F03, at the top left above the A/C clutch diode D01; R202 is the A/C clutch relay; the two unlabelled sockets are connectors. D02 is the One Touch Integrated Start (OTIS) diode (from the late-2007 guide on).