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