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Improper charging (overdischarge or over charge of battery)
Troubleshooting Tune-up inspection Failure cause
No increase of
battery voltage
Battery voltage
rised to normal
value and restore its
original voltage
after killing engine
Measure the voltages
of the both ends of
battery, start the
engine
Normal Abnormal
Inspect whether the voltage regulator
is slack
With voltage No voltage
Measuring alternator coil resistance value
Normal
Abnormal
Normal voltage
Voltage
higher than
normal value
Start engine, the red line of voltage regulator
socket connects to avometer and positive and
negative line connects the voltage of
motorcycle
Check the voltage regulator socket,
the red line connects universal meter
and positive and negative line connect
the volta
cle
Improper charging
Normal
Slack and improper
connection
Inspect whether the connection of
voltage regulator wiring is correct
Voltage regulator unit test
impedance
Expired battery
Bad battery
Bad contact of plug
Open circuit of red line of wiring
Voltage regulator
Open circuit of white line of
wiring
Bad coil
Bad contact of joint
White line of alternator
disconnected
Bad battery
Improper contact of joint and
imperfect earth of wiring
Bad voltage regulator