Failure diagnosis procedure when the light of lamp is weak
The light of lamp is weak
AC power supply illuminating system
DC power supply illuminating system
Disconnect the insert connector between
the magnetor wire bundle and the
complete vehicle cable, use the ohmmeter
measure that if the resistance between the
output conductor terminals of magnetor
lighting coils is less than standard value
Turn on the ignition switch, press the horn button or toggle the
turn signal
The lighting coils
are short-circuited
Start the engine and limit its
rotation speed, disconnect the
insert connector between the
commutation regulator and the
complete vehicle cable to check
the brightness of lamps
The lamp lights return to
normal after disconnecting
The lamp light is still weak
after disconnecting
The stabilized voltage of
commutation regulator is
too low
Check if wires in the
magnetor charging coils and
charging system are
short-circuited
The sound of the
electric horn is
loud and the light
of turn signal is
bright
The electric horn sounds raucously,
and the light of turn signal is pale
The electricity supply in storage
battery is insufficient or the
connection between the storage
battery to ignition switch is in
bad contact
Disconnect the head lamp assembly,
and check if the bulb glass of head
lamp is black or yellowish-green
Check if the bulb power used in
the illuminating system meets
the specified requirements
Replace the bulb of
head lamp
1. Check if the internal contacts of
lighting switch and dimmer switch
are in bad contact
2. Check if the insert connector in
the system and earth wire are in
bad contact
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