12 31 009 Checking alternator and regulator switch: Notes

WARNING: This page is about a different car, the 2003 BMW 530i, 2002 BMW 530i, and 2001 BMW 530i. However, it is still accessible from the selected car via links, so may be relevant.

Test requirements:

Correct Connections On Charged Battery
Correct Connections On Alternator And Starter Motor
Good Ground Connection Between Engine And Body
Tightened Drive Belt

Connect DIS Tester.

Measurement
Checking alternator

If charge indicator lamp is permanently lit:

Remove voltage regulator and check carbon brushes, replace if necessary.

Fig 1: Checking Voltage Regulator And Carbon Brushes

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Minimum length of carbon brushes "A" = 5 mm.

Replace alternator regulator switch, refer to 12 32 501 REPLACING VOLTAGE REGULATOR (VALEO/BOSCH) .

If charge indicator lamp goes out while engine is running:

Check control voltage, refer to ENGINE ELECTRICAL SYSTEM - TECHNICAL DATA .

Regulator switch must be replaced if control voltage is not achieved.

Replace alternator regulator switch, refer to 12 32 501 REPLACING VOLTAGE REGULATOR (VALEO/BOSCH) .