Voltage regulator check
A malfunction in the voltage regulator might cause the following problems depending on the type of
fault:
Alternating current section
1) Bulbs burned out (regulator in short circuit).
2) Malfunctioning of the lighting system and the
electric starter (regulator interrupted).
Direct current section
3) Battery not recharging.
4) Turn indicators not working.
The regulator is earthed through the electrical sys-
tem, so the regulator body does not earth the
circuits inside the regulator.
There must be insulation between each regulator
terminal and the regulator body (use the tester to
check electric resistance).
Measures
1) Bulbs burn out
Replace the regulator because it is certainly inef-
ficient.
2) Lights and starter not working
Gain access to the voltage regulator, start the en-
gine and keep it at idle speed; keep the vehicle
lighting system off.
Connect the tester positive end (select it to detect
alternating voltage) to terminal No 1 (grey cable)
and the negative end to terminal No 2 (black ca-
ble); check there is voltage (see figure).
If there is voltage, check the wiring connecting
lights switch and the regulator and make sure the
switch works properly.
If no voltage is detected, try connecting the nega-
tive end directly to earth; if voltage is detected with
this operation, check the earth wiring of the regu-
lator; otherwise, replace the regulator because it
is damaged.
Electrical system MSS ZIP 100 4T
ELE SYS - 56
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