Yamaha MIO Service Manual page 282

EAS00775
3. Charging voltage
• Connect the engine 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
• 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. Charging coil resistance
• Disconnect the A.C. magneto coupler from
the wire harness.
• Connect the pocket tester (Ω × 1) to the
charging coil as shown.
Positive tester probe → white 1
Negative tester probe → black 2
• Measure the charging coil resistances.
Charging coil resistance
0.32 ~ 0.48 Ω at 20 °C (68 °F)
• Is the charging 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.
7 - 28
ELEC
B Y/R W
2
1
YES
Replace the pick up
coil/stator coil assem-
bly.
YES
Properly connect or
repair the charging
system's wiring.
– +
W/R W/L
NO
NO