Yamaha DT125RE 2005 Service Manual page 272

EAS00774
TROUBLESHOOTING
The battery is not being charged.
1. main fuse
2. battery
3. charging voltage
4. charging coil resistance
5. wiring connections
(of the entire charging system)
NOTE:
• Before troubleshooting, remove the follo-
wing part(s):
1. Side covers (Left and right)
2. Seat
3. Fuel tank
4. Radiator cover
• Troubleshoot with the following special
tool(s).
Engine tachometer
90890-03113
Pocket tester
90890-03112
1. Fuse
• Remove the fuse.
• Connect the pocket tester (Ω 100) to the
fuse.
• Check the fuse for continuity.
• Is the fuse OK?
YES
2. Battery
• Check the battery condition.
Refer to the "BATTERY INSPECTION" sec-
tion in CHAPTER 3.
• Is the battery OK?
YES
CHARGING SYSTEM
NO
Replace the fuse.
NO
Replace the battery.
EAS00775
3. Charging voltage
• Connect the engine tachometer to the
spark plug lead.
• Connect the pocket tester (DC 20 V) to the
battery.
Positive tester probe
terminal
Negative tester probe
terminal
• Start the engine and let it run at approxi-
mately 3000 r/min.
• Measure the charging voltage.
Charging voltage
14 V at 5000 r/min
NOTE:
Make sure the battery is fully charged.
• Is the charging voltage within specification?
YES
EAS00779
4. Wiring
• Check the wiring connections of the entire
charging system.
Refer to "CIRCUIT DIAGRAM".
• Is the charging system's wiring properly
connected and without defects?
YES
Replace the recti-
fier/regulator.
8-15
ELEC
positive battery
negative battery
NO
The charging circuit
is OK.
NO
Properly connect or
repair the charging
system's wiring.