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WARNING:To reduce risk of electrical shock, always replace
the cover to the Power Distribution Box before reconnecting the
battery or refilling fluid reservoirs.
If the battery has been disconnected and reconnected, refer to the
Batterysection of theMaintenance and Specificationschapter.
The high-current fuses are coded as follows:
Fuse/Relay
LocationFuse Amp
RatingProtected 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
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Page 324 of 419

Fuse/Relay
LocationFuse Amp
RatingProtected Circuits
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)
22 Relay Stop lamps, Center High-Mounted
Stop Lamp (CHMSL), TBC, Customer
access
23 15A** Heater mirror, Heated spotted mirror
24 40A* Blower motor relay
25 — Not used
26 30A* ESOF relay lo-hi
27 50A* Glow Plug Control Module (GPCM) #1
(Diesel engine only)
28 20A* Heated mirror relay
29 30A* Passenger power seat
30 10A** A/C clutch relay
31 15A** Power fold mirror relay
32 20A** Fuel pump relay
33 20A** Back-up lamp relay
34 25A** Trailer stop/turn relay
35 5A** ESOF relay coils
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USA(fus)
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Page 344 of 419
4. Check all battery terminals and remove any excessive corrosion before
you attach the battery cables. Ensure that vent caps are tight and level.
5. Turn the heater fan on in both vehicles to protect from any electrical
surges. Turn all other accessories off.
Connecting the jumper cables
1. Connect the positive (+) jumper cable to the positive (+) terminal of
the discharged battery.
Note:In the illustrations,lightning boltsare used to designate the
assisting (boosting) battery.
2. Connect the other end of the positive (+) cable to the positive (+)
terminal of the assisting battery.
+–+–
+–+–
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USA(fus)
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Page 416 of 419

recommendations ...................374
refill capacities ........................405
Event data recording ....................7
Exhaust fumes ..........................278
F
Fail safe cooling ........................382
Family entertainment system ....51
Fluid capacities .........................405
Fog lamps ....................................89
Four-Wheel Drive vehicles .......296
description ..............................301
driving off road .......................303
electronic shift ................297, 301
indicator light .........................298
lever operated shift ................299
manual locking hubs ..............297
preparing to drive your
vehicle .....................................284
Fuel ............................................383
calculating fuel
economy ..........................139, 388
cap ...........................................386
capacity ...................................405
choosing the right fuel ...........387
comparisons with EPA fuel
economy estimates .................391
detergent in fuel .....................388
filling your vehicle
with fuel ..................383, 386, 388
filter, specifications ........383, 404
fuel pump shut-off switch .....317
improving fuel economy ........388
octane rating ...................387, 409
quality ......................................387
running out of fuel .................388
safety information relating to
automotive fuels .....................383Fuel pump shut-off switch .......317
Fuses ..................................318–319
G
Gas cap (see Fuel cap) ............386
Gas mileage (see Fuel
economy) ...................................388
Gauges .........................................21
transmission fluid
temperature gauge ...................26
H
Hazard flashers .........................316
Head restraints .................172, 178
Headlamps ...................................89
aiming ..................................91, 93
autolamp system .......................89
daytime running lights .............90
flash to pass ..............................90
high beam .................................90
replacing bulbs ...................97–99
turning on and off ....................89
Heating
heater only system ...................80
heating and air conditioning
system .................................81, 84
Homelink wireless control
system ........................................123
Hood ..........................................368
I
Ignition ...............................275, 409
Illuminated visor mirror ...........105
Infant seats
(see Safety seats) .....................206
2009 F-250/350/450/550(f23)
Owners Guide, 3rd Printing
USA(fus)
Index
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