PIAGGIO Liberty 50 4tempi 2008, Workshop Manual, Page: 53 / 195

1) BULBS BURNT
Replace the regulator because it is certainly inef-
ficient.
2) LIGHTS AND STARTER NOT WORKING
Access the voltage regulator by removing the plas-
tic cover on the legshield; start the engine and
keep it running 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 probe directly to earth; if voltage is detected
with this operation, check the earth wiring of the
regulator; otherwise, replace the regulator be-
cause it is damaged.
As a last check, the voltage supplied by the stator
can be measured:
- Disconnect the regulator connector and place a
tester between the Grey-Blue cable (4) and the
earth in order to detect alternating voltages (see
figure).
- Voltage supplied at 2,000 rpm must be about 25
÷ 35V.
If no values are detected with this test, replace the
regulator because it is obviously broken.
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).
Liberty 50 4tempi
Electrical system
ELE SYS - 53