BMW K 1100 LT Repair Manual page 108

Troubleshooting
Troubleshooting on alternator
Alternator makes noises.
Do carbon brushes whistle?
Battery produces excessive gas (vapour)
Check contact between regulator/alternator
and between alternator/diode carrier.
Is contact poor?
Check regulator.
Is regulator defective?
Check battery.
Is battery defective?
12.22
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no
no
no
manuals search engine
yes
Rework slip rings/replace carbon brushes.
yes
Repair cable connections.
yes
Renew regulator.
yes
Renew battery.