Electrical equipment and devices of the car BMW 3 Series E21

Characteristics of the battery, alternator and starter
Accumulator battery Technical specifications Generator Bosch brand alternator variable» o current, three-phase, with built-in rectifier unit and electronic...

Fuses
Fuses and relays are located in a separate box installed in the engine compartment on the left side of the car. Circuits protected by fuses on vehicles with...

Lamps used on the car
Headlights «315», «316», «318» Two round headlights with double filament bulbs. Diffuser diameter mm: 170. Other models Four round headlights. Dipped beam -...

Generator parts
Generator details: 1 - cover on the drive side; 2 - stator; 3 - rectifier block; 4 - cover from the side of slip rings; 5 - voltage regulator assembly with...

Starter parts
Starter details: 1 - cap; 2 - starter cover bushing; 3 - cover from the side of the collector; 4 - excitation windings; 5 - body; 6 - anchor; 7 - brush base...

Removal and installation of the generator
Warning. Any work on the generator must be carried out with the engine stopped. Disconnect the red wire from the terminal «B+» and the blue wire from the...

Disassembly and assembly of the generator
Disassembly and assembly of the generator is not difficult (follow the detail view). Check: condition, degree of wear, fit of the brushes to the rings and the...

Generator brush replacement
Unscrew the screws securing the voltage regulator and remove the regulator together with the brush holder from the generator. Desolder worn brushes and solder...

Checking the generator voltage regulator
Make sure the battery voltage is correct. Turn on the voltmeter between the output «D+» generator and «weight». Measure the voltage, which at a crankshaft...

Checking the starter on a car
Make sure the battery is fully charged. Engage one of the gears and press the brake pedal. Turn on the starter for 2-3 s and measure the voltage at its...

Removal and installation of a starter
Disconnect the wires from the battery terminals. Remove the air filter housing. Disconnect from plug «30» starter wires going to the battery and alternator,...

Replacing the traction relay
Remove the starter. Unscrew the nut on the lower contact bolt of the traction relay and disconnect the stator winding lead from it. Unscrew the screws securing...

Disassembly and assembly of the starter
Disassembly and assembly of the starter is not difficult (follow the detail view). Check: the condition and degree of wear of the brushes. The brushes must...

Headlight adjustment
It is best to adjust the headlights with the help of mobile optical instruments. If they are not, then the adjustment can be carried out through the screen....

Wiper Parts
Wiper parts: A - until April 1979; 3 - from April 1979 1 - electric motor; 2 - casing; 3 - support bar; 4 - axis of the brush lever; 5 - intermediate thrust; 6...

Removal and installation of the wiper motor
Withdrawal Disconnect the wire from the negative battery terminal. Disconnect the drive link. Mark the position of the motor crank. Loosen the crank nut and...