VESPA LX 4T USA Workshop Manual page 56

Electrical system
avoid damaging the instrument measuring the cur-
rent).
Check the voltage at idle is at least 13V (charged
battery) and the recharge current is 1.5 - 2A with
the lighting system and the choke device exclu-
ded, as described in the chapter "CHECKING THE
VOLTAGE REGULATOR".
As the engine speed increases, so do the recharge
current and voltage, and at speeds above 4,000
rpm, a recharging current of approx. 4.5A must be
observed; reactivating the lighting system and
choke device, and operating the stop light and
horn, current values of ≥ 5A may be found, with
voltage readings of 14 - 14.5V (regulator threshold
voltage).
If the readings do not match the above figures,
replace the regulator; otherwise check wiring
and connections.
Electric characteristic
Resistance of voltage regulator
~ 8 MΩ
Turn signals system check
4) TURN INDICATORS NOT WORKING
If the turn indicators do not work, do the following:
- Disconnect the regulator connection and insert
the multimeter probes between the white cable (3)
and the black one (2).
- Turn the key switch to ON and check that the
battery is getting voltage. If no voltage is detected,
repeat the test now between the white cable and
the earth; if there is no voltage even after this op-
eration, check the wiring and the contacts of the
key switch and the battery. If voltage in the battery
is detected (black cable), check the regulator earth
wiring.
ELE SYS - 56
LX 4T USA