YG125-30B
Maintenance Manual
Power supply system
131
Major faults diagnosis
Phenomenon
Possible causes
Solutions
l
No electricity in the complete
vehicle:
l
Replace main fuse;
l
While turning on with the key,
the meter has no display, and
other electrical functions do
not work.
l
Main fuse is blown;
l
Main fuse circuits contact poorly;
l
Accumulator
’
s positive and
negative poles contact poorly;
l
No electricity in accumulator;
l
Ignition switch failed;
l
Ignition switch outgoing line and
the main cable poorly plugged;
l
The main cable related circuit
open circuit or short circuit
l
Replace main fuse
l
Re-plug.
l
Reconnect;
l
Recharge or replace;
l
Repair or replace;
l
Re-plug.
l
Repair or replace;
l
Low accumulator voltage:
l
While powering on, the
meter
’
s voltage alarm lamp
blinks; or the accumulator
’
s
terminal voltage is less then
12V.
l
The vehicle has been stored for
too long, and the accumulator
has discharged automatically;
l
Charging circuit fails in the
complete vehicle.
l
Accumulator fails to store
charge.
l
Recharge it with DC voltage
stabilizing charger;
l
Check the charging circuit.
l
Replace accumulator.
l
Accumulator charges
insufficiently;
l
After the engine is started, the
meter
’
s voltage alarm lamp
blinks; or the accumulator
’
s
terminal voltage is less then
13V.
l
Variable voltage rectifier
’
s
outgoing line is poorly contacted
or plugged with the main cable or
magneto;
l
Related lines of the main cable
are open or shorted.
l
Magneto fails;
l
Variable voltage rectifier fails;
l
Accumulator fails to store
charge.
l
Re-plug
l
Repair or replace;
l
Replace the magneto;
l
Replace the variable voltage
rectifier;
l
Replace accumulator.
l
Accumulator overcharged;
l
Large amount of air bubbles
burst out from the
accumulator.
l
Variable voltage rectifier fails.
l
Replace it.
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