Troubleshooting On Alternator - BMW K 1100 LT/RS Repair Manual

Troubleshooting

Troubleshooting on alternator

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