BMW K 1100 LT/RS Repair Manual page 111

Indicator lamp does not light when engine is
stationary and ignition switched on.
no
Check indicator lamp.
Is lamp defective?
no
Check battery.
Is battery discharged/defective?
no
Check alternator.
Has generator short at positive diode?
no
Check cable.
Is cable loose/damaged?
no
Check regulator.
Is regulator defective?
no
Check carbon brushes.
Are carbon brushes worn?
no
Check rotor winding.
Do slip rings have oxidation layer?
no
Check rotor winding.
Is rotor winding broken?
yes
Replace indicator lamp.
yes
Charge/renew battery.
yes
Immediately disconnect charge line (discharge
when stationary). Repair alternator.
yes
Secure connections/renew cable.
yes
Renew regulator.
yes
Renew carbon brushes.
yes
Repair alternator.
yes
Renew rotor.
12.25