Failure diagnosis procedure when all the lamps don’t work
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
lamp-testing method to check if there is electrical energy
output from the output wire of magnetor lighting coil
Press the horn button or
toggle the steering lamp
switch
Testing lamp does not work
The magnetor lighting
coil or its output wire is
broken or short-circuited
Start the engine, disconnect
the insert connector between
the commutation regulator and
the complete vehicle cable
The lamp still does not
work
The inside of
commutation regulator is
short-circuited
Disconnect the head lamp
assembly, and check if the bulb
of head lamp is burnt
The electric horn
sounds loudly and the
steering lamp works
The electric horn does not
sound and the steering lamp
does not work
The power supply of
storage battery is
normal
Use a wire to touch the
positive terminal and
negative terminal of the
storage battery quickly, and
check if there is sparkle
Sparkle appears
when touching
No electricity
in the storage
battery
1. Check if the fuse is
burnt out
2. Check if the wires
from the storage
battery to ignition
switch are broken or
short-circuited
3. Check if the ignition
switch is broken or
short-circuited
Replace the bulb of head lamp, and
check if the bulbs of other lamps
are burnt one by one
Use the lamp-testing method to check if
there is electrical energy output from the
power input wire of lighting switch
Use a wire to short circuit the power lead
of lighting switch and the output lead
The wires between the
magnetor or ignition switch to
the lighting switch are broken
or short-circuited
The lamp will work after shortcircuiting
The lamp still doesn’t work after shortcircuiting
The internal contact of
lighting switch is in poor
contact
The wires between the
lighting switch to lamps are
broken or short-circuited
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