Ducati 999S Owner's Manual page 72

Note
Main wiring harness cable does not need to be
disconnected to replace the headlamp bulbs.
Note
Be careful to hold the new bulb at the base only.
Never touch the transparent body with your fingers or it
will blacken resulting in reduced bulb brilliancy.
E
Refitting
After changing the burnt-out bulb, connect the
instrument panel connector to the main wiring harness,
locate the instrument panel to the rubber grommets and
refit panel.
Refit the bottom cover and the headlamp fairing and
secure them using the retaining screws. Make sure the
turn indicator wires are correctly routed in the grooves
inside headlamp supports.
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fig. 67