VESPA 664787 Service Station Manual page 54

Electrical system
Voltage regulator check
Voltage regulator
The malfunctioning of the voltage regulator might
cause the following problems depending on the
type of fault:
1) Lighting system bulbs burn out.
2) Lighting system is not working.
3) Battery overcharges (the main fuse blows).
4) Battery not recharging.
5) Turn indicators not working.
6) Oil and fuel check warning light not working.
Remedies
FAULT 1
Check that the control voltage is between 13V and
14.5V at 5000 rpm with the lights on.
Check that the control voltage is 16V at 5000 rpm
with the lights off.
Replace the voltage regulator if control voltages
are over >16V.
FAULT 2
a) Check that voltage to stator is correctly sup-
plied: disconnect the regulator connector and
place the tester to detect alternating voltages be-
tween the connection of the grey-blue cable (2)
and the black cable (6) to check that the voltage
supplied at 3000 rpm is within 25-30 V (FIG. A). If
faults are detected, replace the stator.
b) If no faults are detected with these controls, re-
place the regulator.
c) If functioning is still not correct even when the
regulator has been replaced, check the connec-
tions of the electrical system.
ELE SYS - 54
Vespa S 50 2T