Ducati MONSTER 1100 S Owner's Manual page 112

A blown fuse can be identified by a broken filament (4, fig. 106).
Important
To avoid possible short circuits, switch the ignition
key to OFF before renewing the fuse.
Warning
Never use a fuse with a rating other than that specified.
Failure to observe this rule may damage the electric system
or even cause fire.
4
INTACT
E
4
BLOWN
fig. 106
111