VESPA LX 150 4T Euro 3 Service Station Manual page 64

Electrical system
Recharge system voltage check
Connect an ammeter induction clamp to the volt-
age regulator positive terminal, measure the bat-
tery voltage and turning on the vehicles lights with
engine off, wait for the voltage to set at about 12
V. Start the engine and measure the current gen-
erated by the system with lights on and a high
running engine.
In case the generated current value is lower than
8A, repeat the test using a new regulator and/sta-
tor alternatively.
Choke Inspection
Refer to the engine section to check the resistance
and operating conditions of the component. As re-
gards voltage supply, keep the connector connec-
ted to the system and check that the two terminals
receive battery voltage when the engine is on
(see figure).
If no voltage is detected, connect the multimeter
negative terminal to the ground lead and the pos-
itive terminal to the automatic starter orange cable;
with the key switch set to "ON" check whether
there is battery voltage; if there is no voltage,
check the wiring connections to the key switch.
If there is voltage, check again the ignition control
unit connector.
After disconnecting the starter, start up the engine
and keep it at idle speed; then check if there is
voltage by connecting the multimeter positive
probe to terminal 9 (Orange), and the negative one
to terminal 11 (White/Black) (see figure).
ELE SYS - 64
Vespa LX 125 - 150 4T Euro 3