Troubleshooting - Yamaha YJ50RN Service Manual

EAS00774

TROUBLESHOOTING

The battery is not being charged.
Check:
1. main fuse
2. battery
3. charging voltage
4. wiring (of the entire charging system)
NOTE:
@
• Before troubleshooting, remove the following
part(s):
1) center cover
2) side cover (left)
3) side cover (right)
• Troubleshoot with the following special
tool(s).
Inductive tachometer
YU-8036-A
Pocket tester
YU-03112
EAS00738
1. Main fuse
• Check the main fuse for continuity.
Refer to "CHECKING THE FUSE" in chap-
ter 3.
• Is the main fuse OK?
YES
CHARGING SYSTEM
NO
Replace the main
fuse.
7 - 22
EAS00739
2. 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 (68°F)
• Is the battery OK?
YES
EAS00775
3. Charging voltage
• Connect the inductive tachometer to the
spark plug lead.
• Connect the pocket tester (DC 20 V) to the
battery as shown.
Positive tester probe →
positive battery terminal 1
Negative tester probe →
negative battery terminal 2
2
• Start the engine and let it run at approxi-
mately 5,000 r/min.
• Measure the charging voltage.
Charging voltage
14 V at 5,000 r/min
– +
ELEC
NO
• Clean the battery
terminals.
• Recharge or
replace the battery.
1
7