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 devicesEngaged gear indicator
This function displays the gears (1, fig. 25).
The instrument panel receives information and indicates the
engaged gear or "n" for neutral.
Note
In the case of a gear sensor "error", a dash "-" (not
flashing) will be displayed.
...
Entering pin code function for vehicle release
This function turns on the motorcycle "temporarily" in the
case of hf (hands free) system "malfunctions".
To activate the function, press the "emergency" hands free
button (7, fig. 87) If the motorcycle cannot be turned on using
the normal starter button.
After ...
Ducati limited warranty on emission control system
Ducati north america, inc., 10443 Bandley drive cupertino,
california, 95014 warrants that each new 1998 and later
ducati motorcycle, that includes as standard equipment a
headlight, tail-light and stoplight, and is street legal:
a) is designed, built and equipped so as to conform at the
time o ...