Ground Connection Locations; Electrical Power For Lighting And Signalling Devices - Ducati Diavel Workshop Manual

Introduction to the electrical system of the Diavel
In the event of a battery charging circuit fault, check the following in the order given:
- Check the integrity of the electrical circuit connecting the alternator to the regulator and the regulator to the battery (to
carry out these tests, disconnect the battery cables and check the state of the electrical connections and cables and
check for short circuits). Also check the ground connection of the circuit on the engine
- At an engine speed of 2,500 rpm, the alternating charging voltage measured between T – R, T – S and R – S with the
alternator disconnected from the voltage regulator ("zero load") must be between 40V and 50V. This measurement must
only be made with a cold engine, and the alternator must only be disconnected from the voltage regulator in KEY OFF
state. Replace the alternator if the voltage measured is incorrect.
- Check the insulation relative to ground of each of the three terminals (the resistance between R - Ground, T - Ground
and S - Ground must be infinite). If insulation is compromised, change the alternator windings
- The battery state of charge must be checked first before checking the function of the voltage regulator. Battery state of
charge is ideal if the voltage measured between the battery poles is between 12.2V and 12.7V. The battery must be
disconnected from the motorcycle electrical system for this measurement. After reconnecting the battery to the
motorcycle electrical system, turn the engine on and maintain an engine speed of 3,000 rpm. At this engine speed, the
voltage measured at the battery poles must be between 14V and 15V. If the battery voltage measured is incorrect,
replace the voltage regulator

Ground connection locations

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.

Electrical power for lighting and signalling devices

The front and rear running lights consist of LED units with light conduits. As a result, the light source is not visible as the
light is diffused through the surface of the light conduit.
These two images illustrate the front and rear running lights with light conduits.