The most common reason for a low alternator voltage output measurement is that the stator lead wire insulation is heat damaged. To diagnose this, strip away the common sheath that the stator wires run in and then separate the wires from themselves and from any grounded component. Then re-measure their output AC voltage. Examine the insulation for any softening due to heat damage that will cause them to short together at voltage levels lower than the alternator's rated output level. It's rare to see failed stator windings, but it's very common to see stator lead wires overheat and damage their insulation - because Ducati has supplied seriously under-sized wires - given that they have to carry 30-plus amps. Replacing the wires with a heavier gauge between the stator and the regulator cures the low voltage problem.
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