Ducati MONSTER S4R Manuel D'utilisation Et Entretien page 148

Fuses
The fuse box is located under the fuel tank.
To expose the fuses, take off the box protective cover
(1, fig. 66), which is marked with the mounting position
and ampere rating of the fuses.
The fuse next to the battery protects the electronic
regulator.
Remove the protective cap (2, fig. 68) to expose the fuse.
A blown fuse is identified by the interrupted inner filament
(3, fig. 67).
Important
Switch the ignition key to OFF before replacing the
fuse to avoid possible short circuits.
Warning
Never use a fuse with a rating other than specified.
Failure to observe this rule may damage the electric
system or even lead to fire.
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