Generic Race 50, Service Manual

Page: 38 / 209

37
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Trouble diagnosis program for the malfunction that none of illuminating lamps comes on
None of
illuminating
AC power supply
lighting system
DC power supply
lighting system
Disconnect bundle conductor of
magneto from connector of complete
vehicle cable and then use test lamp
method to check if electric power is
output from output conductor of
lighting coil of magneto.
Depress horn button
or toggle turn signal
lamp switch
Test lamp
does not
Test lamp
comes on
Lighting coil of
magneto or its
output conductor
opened or shorted
Start engine and disconnect
rectification regulator from
connector of complete
vehicle cable
Illuminating
lamp comes on
Illuminating
lamp does not
Internal short circuit of
rectification regulator
Disconnect head lamp
unit to check if head
lamp bulb has been
burned out
Electric horn makes
loud and clear sound
and turn signal lamp
comes on
Electric horn does
not make sound
and turn signal
lamp does not
Power
supply
from
battery is
Score and touch positive
and negative of battery
instantly with a
conductor to view status
of sparks
No sparks are
generated
Sparks are
generated
No
electricity in
1. Check for blown
fuse
2. Check for opened
or shorted circuit
between battery and
ignition switch
3. Check ignition
switch for open
circuit or short
circuit
Replace head lamp bulb and check
other illuminating lamp bulbs one
by one for burn-out
Use test lamp method to check
power input conductor of
lighting switch for electric
power output
Short power supply conductor
and output conductor of lighting
switch with a conductor
Circuit between magneto or
ignition switch and lighting
switch opened or shorted
After shorted,
illuminating lamp
After shorted,
illuminating lamp does
Internal contact of
lighting switch
contacts poorly
Circuit between lighting
switch and illuminating lamp
opened or shorted