Specifications

Electrical system
Voltage 12 Volt
Earth (ground) Negative ( - )
Battery
Manufacturer BMW - Mareg
Capacity:
Standard models up to 1986 20 Ah
Standard models from 1987 on 25 Ah
Standard optional all models 30 Ah (may be fitted to K100LT as standard)
Electrolyte specific gravity 1.280 @ 20°C (68°F)
Altenator
Type Bosch 0.120.339.546. G1 -14V 33A 27
Rated output 460W/14V 33Ah
Reduction ratio 1.5:1
Maximum speed 12300 rpm
Voltage regulator Bosch 1.197.311.001. EL 14V 4C
Charge starts at 950 ± 50 rpm
Regulated voltage 13.7 - 14.5 volts
Stator winding resistance - across phase outputs 0.28 ohm ± 10%@ 60°C (140°F)
Resistance between slip rings - exciter winding 4.0 ohm ± 10% @ 60°C (140°F)
Stator/rotor air gap 0.22 mm (0.0087 in)
Rotor maximum runout at claw poles 0.05 mm (0.0020 in)
Slip ring maximum runout 0.03 mm (0.0012 in)
Slip ring 0D Standard 27.8 mm (1.0945 in)
  Service limit 26.8 mm (1.0551 in)
Brush projection Standard 10 mm (0.3937 in)
  Service limit 5 mm (0.1969 in)
Starter motor
Type Nippon Denso 028000 - 8990
Power 0.7kW (1 hp)
Reduction ratio - overall 27:1
Lockout effective above 711 rpm
Brush length - see text Standard - approximate 12 mm (0.4724 in)
  Service limit 50% of new length
Fuses - Circuit protected Fuse rating
1 Instrument cluster, stop and tail lamps 7.5 Amp
2 Parking lamp 7.5 Amp
3 Turn signals, clock 15 Amp
4 Power socket - where fitted 15 Amp
5 Optional extra equipment - where fitted 15 Amp
6 Fuel pump 7.5 Amp
7 Horns, radiator fan 15 Amp
Bulbs
Headlamp 12V, 60/55W-H4
Parking lamps 12V, 4W
Tail lamp 12V, 10W
Stop lamp 12V, 21W
Turn signal lamps 12V, 21W
Turn signal warning lamps 12V, 4W
All other warning and instrument illuminating lamps 12V, 3W
Torque wrench settings 75 models 100 models
Component Nm lbf ft Nm lbf ft
Alternator shock absorber body retaining nut 50 ± 6 37 ± 4.5 31 23
Alternator mounting bolts 22 ± 3 16 ± 2 14 ± N/Av N/Av
Starter motor mounting bolts 7 ± 1 5 ± 0.5 6 4.5

 

Next Section: 1 - General description

Bulb H4-55/60W for headlight
Bulb H4 55/60W for headlight

Bulb 21W
Bulb 21W for stop or turn signal lamp

Fuses
European fuses


Different type of blade fuses


Sketch of a GOOD and a BLOWN fuse