Ducati MONSTER S4 Owner's Manual page 110

Turn indicators (fig. 37)
Remove the screw (1) and detach the glass (2) from the
body.
The bulb is of the bayonet-type: press and rotate anti-
clockwise to remove. Fit the spare bulb by pressing and
turning clockwise until it clicks. Refit the glass sliding the
small tab (A) into the suitable slot in the indicator body.
Tighten the screw (1).
E
2
46
A
fig. 37
Stop light (fig. 38)
To replace the stop and parking light bulb, unscrew the
two screws (1) that secure the glass (2). Remove the
glass. The bulb is of the bayonet-type: press and rotate
anti-clockwise to remove. Fit the spare bulb by pressing
and turning clockwise until it clicks. Refit the glass.
Number plate light (fig. 38)
To expose the number plate bulb, withdraw the lamp
holder from inside (3), then extract the bulb and replace
it.
1
3
1
2
fig. 38