VESPA 664787 Service Station Manual page 55

Vespa S 50 2T
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.
FAULT 4
a) Place the tester that detects alternating voltages
between the connection of the yellow cable (8) on
the regulator and the black cable (6) (FIG. D) to
check that the voltage supplied by the generator
at 3000 rpm is within 26 ÷ 30 V (the battery should
be disconnected to measure this). If faults are de-
tected, replace the stator; otherwise, proceed to
point b).
b) Yellow/black cable (1) connected to the regula-
tor. Insert an ammeter between the grey/blue ca-
ble (2) of the stator and the battery and use the
tester to check that the current supplied at 3000
rpm is approx. 1.5 ÷2 Ampere (FIG. C).
If the values detected are lower than those speci-
fied, replace the regulator.
Before carrying out the checks on the regulator
and the corresponding system, it is always good
practice to check that there is continuity between
the black cable and the earthing.
ELE SYS - 55