Yamaha RS90K, Service Manual

Page: 656 / 841

8-18
– +
ELEC
CHARGING SYSTEM
TROUBLESHOOTING
1. Connect:
• Pocket tester
(to the battery terminals)
2. Measure:
• Battery voltage
OK
BATTERY IS NOT CHARGED.
Battery voltage:
more than 12 V at 20 °C (68 °F)
OUT OF SPECIFICATION
• Check the battery.
• Replace and/or charge the battery.
Refer to “BATTERY INSPECTION” in CHAP-
TER 2.
3. Start the engine and accelerate to 5,000 r/min.
NOTE:
Place the machine onto a suitable stand to raise
the track off of the ground.
4. Measure:
• Charging voltage
CAUTION:
Never disconnect the battery cables while the
generator is operating; otherwise, the rectifier/
regulator will be damaged.
OK
Charging voltage:
14 V/5,000 r/min
OUT OF SPECIFICATION
• Check the main fuse.
Refer to “FUSE INSPECTION” in CHAPTER 2.
• Check the stator coil.
OK FAULTY
Replace the main fuse and/or the sta-
tor coil assembly.
Replace the rectifier/regulator.
OK
Correct the connector.
Check the charging system’s wiring. Refer to
“CIRCUIT DIAGRAM”.
FAULTY
Properly connect or repair the charging system’s
wiring.