The High-Current Fuses Are Coded As Follows - Ford 2009 F-150 Owner's Manual

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
13
14
320
2009 F-150 (f12)
Owners Guide, 2nd Printing
USA (fus)
Fuse Amp
Rating
— Powertrain Control Module
(PCM) power relay
— Starter relay
— Blower motor relay
— Heated backlite relay
— Not used
— Trailer tow park lamp relay
— Not used
— Fuel pump
— Trailer tow battery charger
— Not used
30A** Power running board motors
— Not used
30A ** Starter relay
30A** Passenger power seats
Protected Circuits