Voltage Regulator Check; Bursting Light Bulbs; Headlights And Choke Not-Operational - VESPA ET4 50 Workshop Manual

ET4 50

Voltage regulator check

The malfunctioning of the voltage regulator might cause the following problems depending on the type
of fault:
1) Bulbs burnt out (regulator in short circuit).
2) The lighting and electrical starter system do not work (regulator interrupted).
3) Battery fails to charge
4) Turn indicators failure
The regulator is provided with earth supplied from the electrical equipment, therefore the regulator body
does not supply earth to the internal circuits. Check the insulation between each terminal of the regulator
and its body, using the specific tester.

1) BURSTING LIGHT BULBS

Replace the voltage regulator as this is definitely
faulty.
2) HEADLIGHTS AND CHOKE NOT-OPERA-
TIONAL
In order to leave the AC free from absorptions, so
to carry out voltage checks, please proceed as fol-
lows. Remove the handlebar covers. Detach the
connections from the headlight and the 5 PIN con-
nector from the dashboard. Remove the taillight
bulb. Remove the automatic choke connector from
the system.
Access the voltage regulator, start the engine and
let it run at idle.
Insert the positive terminal from the tester (setting
the tester on AC mode) on terminal no. 1 (yellow-
black wire) and the negative terminal on terminal
no. 2 (black wire); check for voltage (see figure).
If voltage is present, check the wiring from the
headlight to the voltage regulator, and the opera-
tion of the light switch.
If no voltage is found, put the negative terminal to
earth; if this provides voltage readings, check the
earth wire (terminal no. 2) on the regulator (black
wire); otherwise, replace the regulator as certainly
faulty.
Electrical system
ELE SYS - 49