The following table and diagram show the 2008 Ford Super Duty F-650 F-750 Passenger Compartment Fuse Panel and Relay, Fuse/ Relay location, fuse ampere rating, and fuse description. (click image to enlarge)

2008 Ford Super Duty F-650 F-750 Fuse Panel Relay

Fuse/Relay Location Fuse Amp Rating Fuse Description and Circuit Protected
1
2
3
4
20A
15A
20A
10A
Horn relay
Flasher
Cigar lighter
Diagnostics, Parking brake warning
5 15A Blend door actuator, Climate mode, Back-up lamps, DRL signal, Heated seats, Trailer , Exhaust brakes
6
7
8
9
10
11
-
-
5A
5A
15A
5A
Not used
Not used
Radio, GEM 4
switch LED and relay
Heated mirrors
, Washer pump relays
12 10A Stoplamp switch (Hydraulic brake vehicles only), Allison push-button shifter
13
14
15
16
17
18
19
20
21
20A
10A
10A
15A
-
5A
15A
5A
10A
Cluster, Radio
Interior lamp relay
Interior lamp relay, GEM, Vanity mirrors
High beams, Indicator
Not used
Headlamp switch interior lighting
Engine control
Starting system
DRL resistor
22 15A Air horn, Air suspension dump, Two-speed axle, Driver-controlled locking differential
23
24
25
26
27
28
29
30
31
10A
15A
10A
10A
-
10A
10A
15A
-
Flasher
, Air dryer, Vacuum pump, Fuel heater relay
Function selector switch
RH low beam headlamp
Not used
LH low beam headlamp
Cluster warning lamps, Gauges, Hydraulic
Allison electronic transmission
Not used
Relay 1
Relay 2
Relay 3
Relay 4
Relay 5
-
-
-
-
-
Interior lamps
Not used
Horn
One-touch down window
Not used

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