Yamaha YBR250 2007, Service Manual

Page: 335 / 361

ELEC
CHARGING SYSTEM
3. Charging voltage
Replace the stator.
5. Wiring
YES NO
Connect or repair the
charging system
wiring.
• Connect the pocket tester (DC 20 V) to the
battery, as shown.
4. Stator coil resistance
• Disconnect the generator connector from
wiring harness.
• Connect the pocket tester (
Ω
x 1) to the
charging coils, as shown.
Positive tester probe --> white
1
Negative tester probe --> white
2
Positive tester probe --> white
1
Negative tester probe --> white
3
• Measure the stator coil resistance.
Stator coil resistance
0.42 ~ 0.62
Ω Ω Ω Ω Ω
--> at 20ºC (68°F)
(between black and white)
• Is the stator coil OK?
YES NO
• Check the connections of the charging
system. Refer to “CIRCUIT DIAGRAM”.
• Is the charging system’s wiring properly
connected and without defects?
Replace the
rectifier/
regulator.
7-25
Make sure the battery is fully charged.
YES NO
• Start the engine and let it run at
approximately 5,000 r/min.
• Measure the charging voltage.
NOTE:
• Is the charging voltage within
specification?
Charging voltage
14.0 V at 5,000 rpm
The charging
circuit is OK.
If the charging voltage
is above the standard,
replace the rectifier
(regulator).
If the charging voltage
is below the standard,
check the stator coil
resistance.
Positive tester probe--> battery positive
terminal
Negative tester probe --> battery negative
terminal