BMW K 1100 LT/RS - Manual (Page 115)

12.29
Troubleshooting on battery
Battery produces excessive gas.
no
Check battery.
Is battery defective? yes
Renew battery.
no
Check contact between regulator/alternator
and between alternator/diode carrier.
Is contact poor?
yes
Repair cable connections.
no
Check regulator.
Is regulator defective? yes
Renew regulator.
Acid level too low.
no
Check level.
Is level below set level? yes
Top up with distilled water.
no
Check charge status.
Is battery overcharged? yes
Top up with distilled water.