FORD 2009 F-550 v.1 - Manual (Page 318)

The fuses are coded as follows.
Fuse/Relay
Location
Fuse Amp
Rating
Protected Circuits
1 30A Not used (spare)
2 15A Not used (spare)
3 15A Family Entertainment System
(FES)
4 30A Not used (spare)
5 10A Keypad illumination, Brake-Shift
Interlock (BSI), SPBJB
6 20A Turn signals
7 10A Left headlamp (Low beam)
8 10A Right headlamp (Low beam)
9 15A Interior lighting, Lighted running
boards
2009 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)
Roadside Emergencies
318