VESPA ET4 50, Workshop Manual

Page: 50 / 185

As a last test it is possible to check the output volt-
age from the stator:
-Detach the regulator connector and interpose the
tester in AC mode, between the Gray-Blue wire (4)
and earth (see figure).
-The voltage output at 2,000 rpm must be approx.
25 - 35V
If this test also gives no voltage, replace the reg-
ulator as certainly faulty.
N.B.
TO MEASURE THE ABOVE VOLTAGE USE AN ANALOGUE
TESTER THAT CAN MEASURE ALTERNATING VOLTAG-
ES AND KEEP THE ENGINE AT IDLE TO HAVE AN ALTER-
NATING VOLTAGE OF A FREQUENCY AS CLOSE AS
POSSIBLE TO 50HZ SO AS TO DETECT THE EFFICIENT
VOLTAGE VALUE SUPPLIED BY THE REGULATOR
(ABOUT 12V).
Recharge system voltage check
3) BATTERY DOES NOT RECHARGE
The fault in the DC section of the voltage regulator
may cause, depending on the type of failure, the
following faults:
a) Bursting of protection fuse due to exces-
sively high voltage (regulator short-circuited)
and resulting in the battery not recharging.
b) Battery not recharging (regulator circuit in-
terrupted).
Interventions
a) Bursting of protection fuse (regulator short-
circuited).
Check the wiring running from the fuse to the ig-
nition key-switch is not damaged, as this may cre-
ate a short-circuit with earth (thus excluding
possible regulator failures); if the protection fuse
bursts only after the ignition key-switch is turned
to "ON", and with the regulator connector detach-
ed, it is then necessary to check the wirings and
systems downstream the key-switch are not short-
circuited with earth.
Electrical system
ET4 50
ELE SYS - 50