VESPA LX 50 Workshop Manual page 52

Electrical system
6) Failure of the oil and petrol check lamp.
Operations
FAULT 1:
Make sure that at 5000 rpm with the lights on that
the regulation voltage is between 13V and 14.5V.
Make sure that at 5000 rpm with the lights off the
regulation voltage is ï£ 16V.
If the regulation voltage is greater than >16V re-
place the regulator.
FAULT 2:
a) Make sure the stator is supplying voltage cor-
rectly: disconnect the regulator connector and
place tester 020331 y between the grey-blue wire
(2) and the black wire (6) to measure the alternat-
ing voltage and make sure that the voltage sup-
plied at 3000 rpm, is between 25 and 30V (FIG>
A). If there are any anomalies, replace the stator.
b) If the tests do not reveal any anomalies, replace
the regulator.
c) If replacement of the regulator does not restore
correct operation, check the connections of the
electrical system.
FAULT 3
After checking that there are no short circuits in the
system towards earthing with the engine off and
the regulator connector detached, replace the reg-
ulator because it is certainly inefficient, and re-
place the protection fuse.
Following the replacement, measure the current
and the recharging voltage on the battery ends
(FIG. B). The values detected must be 1.5 ÷ 2 A
and 13 V at 3000 rpm.
ELE SYS - 52
Vespa LX 50