Yamaha YP400T, YP400V, YP400W Service Manual page 356

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 → white 1
Negative tester probe → white 2
Positive tester probe → white 1
Negative tester probe → white 3
W W W
1
• Measure the stator coil resistances.
Stator coil resistance
0.184 ~ 0.276 Ω at 20 °C (68 °F)
• Is the stator coil OK?
EAS00779
5. 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?
Replace the rectifier/
regulator.
8 - 25
ELEC
2 3
YES
Replace the crank-
shaft position sensor/
stator assembly.
YES
Properly connect or
repair the charging
system's wiring.
– +
NO
NO