Connect DIS Tester.

• Measurement
• Checking alternator

If charge indicator lamp is permanently lit:

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

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

Fig 1: Removing Voltage Regulator

If charge indicator lamp goes out while engine is running:

Check control voltage. Refer to 12 32 REGULATOR E38 .

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)  .