FORD 2008 F-550 v.4 - Manual (Page 114)

UPFITTER CONTROLS (IF EQUIPPED)
Your vehicle may be equipped with
the Upfitter option package which
will provide four switches, mounted
in the center of the instrument
panel, labeled AUX 1, AUX 2, AUX 3
and AUX 4. These switches will only
operate while the ignition is in the 3
(ON) position, whether the engine
is running or not. It is, however, recommended that the engine remain
running to maintain battery charge when using the Upfitter switches for
extended duration or higher current draws. (This is even more important
for vehicles with diesel engines since the glow plugs are also draining
battery power when the ignition key is in the 3 [ON] position.)
When switched on by the operator they provide 10 amps, 15 amps or 30
amps of electrical battery power for a variety of personal or commercial
uses.
If your vehicle is equipped with this option, there will also be a relay box
located on the driver side end of the instrument panel. See your
authorized dealer for service.
The relays are coded as shown in
the accompanying illustration.
RELAY
1
RELAY
2
RELAY
3
RELAY
4
2008 F-250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA (fus)
Driver Controls
114