The negative cable, which is normally connected to the negative pole of the battery, is fastened to the crankcase. From here, the cable branches off and splits up within the electrical system to carry the ground connection to the different elements in the system.

The image shows the ground connection on left side of the engine crankcase.
The battery charging circuit and power distribution
Electrical power for lighting and signalling devicesInformation about the model
Identification data
Diavel identification data
Each ducati motorcycle has two identification numbers -the frame number and
the engine number- and an ec nameplate
(a) (not present on the us version).
Note
Please quote these numbers, which identify the motorcycle model, when
ordering spare pa ...
Rear wheel
Right-hand wheel nut
Washer
Spacer
Valve
Wheel
Circlip
Spare parts catalogue
Diavel abs front and rear wheels
Diavel carbon
abs
front and rear wheels
Important
Bold reference numbers in this section identify parts not shown in the
figures alongside the text, but which can ...
Refitting the flywheel-alternator assembly
Fit the roller cage unit (20) with washer (18) and internal ring (19),
applying prescribed grease on the washer (18).
Install the roller cage assembly (20) with the washer (18) and inner race
(19).
Install the flywheel assembly (v) with the gear (21), aligning the notches as
shown in ...