PIAGGIO Liberty 50 Catalyzed, Workshop Manual

Page: 50 / 165

3)BATTERY FAILS TO CHARGE
A fault on the direct current section of the regulator
can result in the following problems, depending on
the type of fault:
a) Blowing of the protecting fuse due to an
overvoltage condition (regulator shorted) pre-
venting the battery from being recharged.
b) Battery fails to recharge (regulator circuit
interrupted).
Interventions
a) Fuse blow (regulator short-circuited).
Check that the wiring that connects the protecting
fuse to the ignition switch is not damaged, which
would cause a short circuit to earth and rule out
possible regulator damage; if the related fuse
blows only after the ignition switch has been turned
to "ON" and if the regulator connector is detached,
check that the wiring and devices following the ig-
nition switch are not shorted to earth.
Measure the resistance between contacts 3
(White) and 2 (Black) on the voltage regulator (the
connector must be disconnected).
The resistance should be approximately 8 MW. If
the measurement differs greatly from the prescri-
bed value, the regulator is shorted and needs to
be replaced.
b) Battery fails to recharge (regulator circuit inter-
rupted).
To check the voltage regulator recharge section,
first connect 2 multimeters (one to measure the
voltage and the other one to measure the current)
as shown in the second figure and use the follow-
ing procedure:
Start the engine (temporarily connect the red cable
to the positive terminal to avoid damaging the in-
strument).
Check that voltage is at least 13V while engine is
idling (battery charged), and that the recharge cur-
Electrical system
Liberty 50 Catalyzed
ELE SYS - 50