Ford F-150 Owner's Manual page 342

Roadside Emergencies
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
1
2
3
4
5
6
7
8
9
10
11
12
342
2012 F-150 (f12)
Owners Guide, 2nd Printing
USA (fus)
Fuse Amp Protected Circuits
Rating
— Powertrain control module (PCM)
relay (3.7L, 5.0L and 6.2L
engines)
— Starter relay
— Blower motor relay
— Rear window defroster relay
— Electric fan relay (high speed)
— Trailer tow (TT) park lamp relay
— Run/start relay
— Fuel pump relay
— TT Battery charger relay
— PCM relay (3.5L engine)
30A** Power running board motors
40A** Electric fan
50A** Electric fan (6.2L with max
trailer tow, SVT Raptor)