Yamaha YP250R 2005 Service Manual page 317

EAS00775
3. Charging voltage
• Connect the pocket tester (DC 20 V) to the
battery as shown.
Positive tester probe →
positive battery terminal
Negative tester probe →
negative battery terminal
• 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
NOTE:
_
Make sure the battery is fully charged.
• Is the charging voltage within specifica-
tion?
NO
YES
The charging circuit
is OK.
CHARGING SYSTEM
EAS00776
4. Stator coil resistance
• Disconnect the stator coil coupler from the
wire harness.
• Connect the pocket tester (Ω × 1) to the
stator coil as shown.
Positive tester probe → red 1
Negative tester probe → red 2
Positive tester probe → red 1
Negative tester probe → red 3
1
R
• Measure the stator coil resistances.
Stator coil resistance
0.385 ~ 0.415 Ω at 20 °C (68 °F)
• Is the stator coil OK?
EAS00779
5. Wiring
• Check the entire charging system wiring.
Refer to "CIRCUIT DIAGRAM".
• Is the charging system wiring properly
connected and without defects?
Replace the rectifier/
regulator.
8 - 23
ELEC
3
R
R
2
YES
Replace the pickup
coil/stator assembly.
YES
Properly connect or
repair the charging
system wiring.
– +
NO
NO