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