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)
| 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 ABS, Exhaust brakes |
| 6 7 8 9 10 11 |
- - 5A 5A 15A 5A |
Not used Not used Radio, GEM 4 Power window switch LED and relay Heated mirrors Wiper motor, 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 ABS, 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 ABS 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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