Troubleshooting - Yamaha CS50 Service Manual

EAS00774

TROUBLESHOOTING

The battery is not being charged.
Check:
1. charging voltage
2. main fuse
3. battery
4. charging coil resistance
5. wiring connections
(of the entire charging system)
NOTE:
• Before troubleshooting, remove the follo-
wing part(s):
1.Front upper cowling
2.Footrest board
• Troubleshoot with the following special
tool(s).
Engine tachometer
90890-03113
Pocket tester
90890-03112
EAS00775
1. Charging voltage
• Connect the engine tachometer to the
spark plug lead.
• Connect the pocket tester (DC 20 V) to the
battery.
Positive tester probe
Negative tester probe
• Start the engine and let it run at approxima-
tely 3000 r/min.
• Measure the charging voltage.
Charging voltage
12 V or more at 3000 r/min
15 V or less at 8000 r/min
NOTE:
Make sure the battery is fully charged.
• Is the charging voltage within specification?
NO
positive battery
terminal
negative battery
terminal
YES
The charging circuit
is OK.
CHARGING SYSTEM
EAS00738
2. Main fuse
• Check the fuse for continuity.
Refer to "CHECKING THE FUSES" in chap-
ter 3.
• Is the fuse OK?
YES
EAS00739
3. Battery
• Check the condition of the battery.
Refer to "CHECKING AND CHARGING THE
BATTERY" in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20°C
• Is the battery OK?
YES
• Clean the battery
terminals.
EAS00776
4. Charging coil resistance
• Disconnect the DC-CDI magneto coupler.
• Connect the pocket tester (Ω x 1) to the
charging coils as shown.
8-20
ELEC
NO
Replace the fuse.
NO
• Recharge or
replace the
battery.
2
W
/
B
L
Y
/
W
R
1