Troubleshooting - Yamaha CS50 Service Manual

EAS00782

TROUBLESHOOTING

Any of the following fail to light: head-
light, high beam indicator light, taillight,
position light, and meter light.
Check:
1. lighting coil resistance
2. dimmer switch
3. wiring connections
(of the entire charging system)
NOTE:
• Before troubleshooting, remove the follo-
wing part(s):
1. Front upper cowling
2. Footrest board
3. Handlebar cover (upper)
• Troubleshoot with the following special
tool(s).
Pocket tester
90890-03112
1. Lighting coil resistance
• Disconnect the DC-CDI magneto coupler.
• Connect the pocket tester (Ωx1) to the
lighting coil as shown.
Positive tester probe
Negative tester probe
• Measure the lighting coil resistance.
Lighting coil resistance:
0.116 ~0.264 Ω at 20°C
• Is the lighting coil OK?
YES
Replace the lighting
coil assembly
2
W
/
B
L
Y
/
W
R
1
Yellow/red
black
NO
LIGHTING SYSTEM
EAS00784
2. Dimmer switch
• Check the dimmer switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the dimmer switch OK?
YES
EAS00787
3. Wiring
• Check the entire lighting system's wiring.
Refer to "CIRCUIT DIAGRAM".
• Is the lighting system's wiring properly con-
nected and without defects?
YES
Check the condition
of each of the
lighting system's
circuits. Refer to
"CHECKING THE
LIGHTING
SYSTEM".
8-23
ELEC
NO
The dimmer switch
is faulty. Replace
the left handlebar
switch.
NO
Properly connect or
repair the lighting
system's wiring.