2012 FORD F450 relay

Power distribution box
The power distribution box is located in the engine compartment. The
power distribution box contains high-current fuses that protect your
vehicle’s main electrical systems from overloads.
WARNING: Always disconnect the battery before servicing high
current fuses.
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
Battery section of the Maintenance and Specifications chapter.
The high-current fuses are coded as follows:
Fuse/Relay
Location Fuse Amp
Rating Protected Circuits
1 Relay Blower motor
2 — Not used
3 Relay Urea heaters (diesel engine)
4 — Not used
5 Relay Rear window defroster
6 — Not used
7 50A* Rear window defroster
8 30A* Passenger seat
9 30A* Driver seat Roadside Emergencies
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USA (fus)

Fuse/Relay
Location Fuse Amp
Rating Protected Circuits
10 — Not used
11 — Not used
12 — Not used
13 — Not used
14 — Not used
15 Diode Fuel pump (diesel engine)
16 — Not used
17 15A** Heated mirror
18 — Not used
19 — Not used
20 — Not used
21 — Not used
22 30A* Trailer tow electric brake
23 40A* Blower motor
24 — Not used
25 30A* Wipers
26 30A* Trailer tow park lamps
27 25A* Urea heaters (diesel engine)
28 — Buss bar
29 Relay Trailer tow park lamps
30 Relay A/C clutch
31 Relay Wipers
32 — Not used
33 15A** Vehicle power (VPWR) 1
34 15A** VPWR 2 (diesel engine)
20A** VPWR 2 (gas engine)
35 10A** VPWR 3
36 15A** VPWR 4 (diesel engine)
20A** VPWR 4 (gas engine)
37 10A** VPWR 5 (diesel engine)Roadside Emergencies
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USA (fus)

Fuse/Relay
Location Fuse Amp
Rating Protected Circuits
38 Relay Powertrain control module
(PCM) (diesel engine),
Electronic control module (ECM)
(gas engine)
39 10A** 4x4 hub lock
40 15A** 4x4 electronic lock
41 — Not used
42 — Not used
43 — Not used
44 — Not used
45 10A** Run/start relay coil
46 10A** Transmission control module
(TCM) keep-alive power (diesel
engine)
47 10A** A/C clutch feed
48 Relay Run/start
49 10A** Rearview camera system
50 10A** Blower motor relay coil
51 — Not used
52 10A** PCM/ECM/TCM run/start
53 10A** 4x4 module
54 10A** Anti-lock brake system (ABS)
run/start
55 10A** Rear window defroster coil,
Battery charge coil
56 20A** Passenger compartment fuse
panel run/start feed
57 Relay Fuel pump
58 — Not used
59 — Not used
60 — Not used
61 — Not used Roadside Emergencies
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2012 F-250/350/450/550 (f23)
Owners Guide, 4th Printing
USA (fus)

Fuse/Relay
Location Fuse Amp
Rating Protected Circuits
62 — Not used
63 — Not used
64 — Not used
65 — Not used
66 20A** Fuel pump
67 — Not used
68 10A** Fuel pump relay coil
69 — Not used
70 10A** Trailer tow backup lamp
71 10A** Cannister vent (gas engine)
72 10A** PCM/ECM relay coil feed
keep-alive power
73 — Not used
74 Relay Trailer tow left-hand stop/turn
75 Relay Trailer tow right-hand stop/turn
76 Relay Backup lamp
77 — Not used
78 — Not used
79 — Not used
80 — Not used
81 — Not used
82 20A* Auxiliary power point #2
83 20A* Auxiliary power point #1
84 30A* 4x4 shift motor
85 30A* Heated/cooled seats
86 25A* ABS coil feed
87 20A* Auxiliary power point #5
88 — Not used
89 40A* Starter motor
90 25A* Trailer tow battery charge
91 — Not usedRoadside Emergencies
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USA (fus)

Fuse/Relay
Location Fuse Amp
Rating Protected Circuits
92 20A* Auxiliary power point #4
93 20A* Auxiliary power point #3
94 25A* Upfitter #1
95 25A* Upfitter #2
96 50A* ABS pump
97 40A* Invertor
98 — Not used
99 — Not used
100 25A* Trailer tow turn signals
101 Relay Starter
102 Relay Trailer tow battery charge
103 — Not used
104 — Not used
105 — Not used
106 — Not used
107 — Not used
* Cartridge fuses ** Mini fuses
CHANGING THE TIRES
If you get a flat tire while driving, do not apply the brake heavily.
Instead, gradually decrease your speed. Hold the steering wheel firmly
and slowly move to a safe place on the side of the road.
Note: If your vehicle is equipped with the tire pressure monitoring
system (TPMS), the indicator light will illuminate when the spare tire is
in use. To restore the full functionality of the monitoring system, all road
wheels equipped with tire pressure monitoring sensors must be mounted
on the vehicle.
If your vehicle is equipped with TPMS, have a flat serviced by an
authorized dealer in order to prevent damage to the TPMS sensors, refer
to Tire pressure monitoring system (TPMS) in the Tires, Wheels and
Loading chapter. Replace the spare tire with a road tire as soon as
possible. During repairing or replacing of the flat tire, have the
authorized dealer inspect the TPMS sensor for damage. Roadside Emergencies
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P
Parental MyKey
programming .............................129
Parking brake ............................273
Parts
(see Motorcraft  parts) ...........410
Pedals (see Power adjustable
foot pedals) ...............................110
Power adjustable foot pedals ...110
Power distribution box
(see Fuses) ...............................327
Power door locks ......................137
Power mirrors ...........................106
Powerpoint ................................101
Power steering ..........................282
fluid, checking and adding ....399
fluid, refill capacity ................411
Power Windows .........................103
Preparing to drive your
vehicle ........................................285
R
Radio ......................................60, 62
Rear-view camera system .........298
Recommendations for
attaching safety restraints
for children ................................197
Relays ........................................321
Remote entry system .......141–142
illuminated entry ....................145
locking/unlocking doors .........142
Remote start ...........................146
replacement/additional
transmitters .............................145
replacing the batteries ...........144 Remote start .............................146
Remote start climate
operation .....................................85
Reverse sensing system ...........296
Roadside assistance ..................319
S
Safety belts
(see Safety restraints) ...........168,
170, 172, 174–175
Safety Canopy ...................185–186
Safety defects, reporting ..359–360
Safety restraints ...............168, 170,
172, 174–175
Belt-Minder  ...........................176
extension assembly ................175
for adults .................170, 172, 174
for children .............................195
warning light and chime ........176
Safety restraints -
LATCH anchors .........................206
Safety seats for children ..........199
Safety Compliance
Certification Label ....................416
Satellite Radio Information ........74
Scheduled Maintenance Guide
Normal Scheduled
Maintenance and Log .............428
Seats ..........................................153
child safety seats ....................199
cleaning ...................................368
climate control ..................81, 162
easy access/easyout feature ..164
memory seat ...................143, 163
SecuriCode keyless entry
system ........................................147Index
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2012 F-250/350/450/550 (f23)
Owners Guide, 4th Printing
USA (fus)