Ducati Diavel Workshop Manual page 184

Battery charging system
Refitting the regulator
Position the regulator (1) on the support.
Tighten the screws (1) to a torque of 10 Nm ± 10% (Sect. 3 - 3,
Important
Do not disconnect the battery cables when engine is running because this would cause irreparable damage to the
regulator.
Operations
Reassemble the electrical
components support
Regulator fuse
The 30 A fuse is located inside the solenoid starter in the electrical components compartment.
Operations
Remove the left belly fairing
Remove the fuse cap (A) to reach it.
A blown fuse can be identified by breakage of the inner filament (B).
Section reference
5 - 6, Reassembling the electrical
components support
Section reference
5 - 5, Removal of belly fairing
Frame torque settings).