Generator. General information and safety precautions (BMW 3 Series E46)

Before performing any work on the charging system, please read the following safety precautions:

1. Never disconnect the battery or voltage regulator while the engine and generator are running.

2. Never short-circuit the generator excitation terminal or the cable attached to it to ground.

3. Never mix up the voltage regulator wires.

4. Never turn on the voltage regulator if it is connected to ground (instant damage).

5. Never remove the generator unless the battery is disconnected from the circuit.

6. When installing the battery, make sure that the negative terminal is connected to ground.

7. Never use a voltage indicator that is connected directly to the household network (110 or 220 V). Use only 12V indicator.

8. If the battery is charged in the installed state by the charger, both battery cables should be disconnected. The positive terminal of the charger should be connected to the positive terminal of the battery, and the negative terminal of the charger should be connected to the negative terminal of the battery.

9. Incorrect connection of wires leads to destruction of the rectifier and voltage regulator.

Checking the installed generator

During normal driving, the charge control lamp should go out. Otherwise, the fault lies in the generator or voltage regulator.

First, check the electrical connections of the alternator. Check if the drive belt is properly tensioned. Further checks can only be carried out with the alternator removed, but you can first check all the fuses.

Service

The generator bearings are long-term lubricated and do not require regular maintenance. Keep the outside of the generator clean and do not allow water or other solvents to come into contact with it.