Ford 2009 F-250 Owner's Manual page 323

The high-current fuses are coded as follows:
Fuse/Relay
Location
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
2009 F-250/350/450/550 (f23)
Owners Guide, 2nd Printing
USA (fus)
Roadside Emergencies
Fuse Amp
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)
40A* ABS module (Pump)
30A* Upfitter auxiliary switch #1
30A* Upfitter auxiliary switch #2
40A* ABS module (Coil)
20A* Cigar lighter
20A* Instrument panel power point
15A** Brake On/Off (BOO) relay feed
5A** Brake switch, Brake switch relay
coil, SJB module, 4x4 module
— Not used
— Not used
Relay A/C clutch
Relay Wipers
Relay Fuel Pump Driver Module
(FPDM), Fuel injectors (Gasoline
engines), Diesel Fuel Control
Module (DFCM) (Diesel engine)
Relay Back-up lamps, Reverse Sensing
System (RSS), Engine
compartment fuse 63
Relay Trailer stop/turn (Left)
Relay Trailer stop/turn (Right)
Protected Circuits
323