Ducati Diavel Workshop Manual page 185

Battery charging system
Important
To avoid possible short circuits, replace the fuse in key OFF condition.
Warning
Never use a fuse with a rating other than the specified value. Failure to observe this rule may damage the electric system
or even cause fire.
Operations
Reassemble the left belly fairing 5 - 5,
1
Section reference
Reassembly of belly fairing