Does Not Charge While Driving

Checking Resistance for Pre-Exciter Circuit

NOTE:
- When problem is "Battery does not charge" even though the warning lamp comes on when ignition is switched on and goes out when ignition is switched off, check resistance of the pre-exciter circuit.
- Use digital multimeter Fluke 83 (US 1119) and connector test kit VW 1594 for all electrical tests.

Checking
- Battery voltage approx. 12V.
- Remove blue wire connector (terminal 61) near starter, from securing clip and separate connector.

Gasoline Engine:
Single connector, in engine compartment, left, near starter.

Diesel Engine:
Double connector, in engine compartment, left, near starter.

- Set digital multimeter Fluke 83 (US 1119) to mA measuring range.
- Connect multimeter leads in series between blue wire connector.
- Specification: 200 mA or more.

NOTE: If the reading is considerably lower than 200 mA, check the blue wire from alternator to instrument cluster for excessive resistance and/or replace the instrument panel printed circuit board.