Ford 2010 F-350 Owner's Manual page 308

Roadside Emergencies
The fuses are coded as follows.
Fuse/Relay Fuse Amp
Location
1
2
3
4
5
6
7
8
9
10
308
2010 F-250/350/450/550 (f23)
Owners Guide, 2nd Printing
USA (fus)
Protected Circuits
Rating
30A Not used (spare)
15A Not used (spare)
15A Family entertainment system (FES)
30A Not used (spare)
10A Keypad illumination, Brake-shift
interlock (BSI), SPBJB
20A Turn signals
10A Left headlamp (Low beam)
10A Right headlamp (Low beam)
15A Interior lighting, Lighted running
boards
15A Cargo lamp, Puddle lamp, Switch
backlight