Ford 2009 F-150 - The High-Current Fuses Are Coded as Follows

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 — Powertrain Control Module
(PCM) power relay
2 — Starter relay
3 — Blower motor relay
4 — Heated backlite relay
5 — Not used
6 — Trailer tow park lamp relay
7 — Not used
8 — Fuel pump
9 — Trailer tow battery charger
10 — Not used
11 30A** Power running board motors
12 — Not used
13 30A ** Starter relay
14 30A** Passenger power seats
2009 F-150 (f12)
Owners Guide, 2nd Printing
USA (fus)
Roadside Emergencies
320