Alternator: Description and Operation

Generator

CAUTION!
When disconnecting and connecting the battery, always perform the work procedure as described in the repair information --> [ Battery, One-Battery Layout, Disconnecting and Connecting ] Battery, One-Battery Layout, Disconnecting and Connecting. Not adhering to sequence will result in the deactivation of Main Battery Switch -E74- and subsequent damage to electrical system components.

• Checking generator:

Based on engine variations, different types of generators were installed.

In vehicles with 6-cylinder gasoline and TDI engines, generator has the following characteristics:

• The generator is driven by a ribbed belt.

• The voltage regulator cannot be replaced separately. If a repair is necessary, the entire generator must be replaced.

• The generator is cooled by the engine coolant circuit. As of model year 2005.

For vehicles with 8 cyl. fuel injection engine, the generator has the following characteristics:

• The generator is driven by a ribbed belt.

• The voltage regulator cannot be replaced separately. If a repair is necessary, the entire generator must be replaced.

• The generator is cooled by the engine coolant circuit.

In vehicles with 10-cyl. TDI engines, the generator has the following features:

• Generator shaft is driven by a clutch bolted to one-way clutch on generator side. On the engine side, a hub grabs in the clutch. This hub is connected by a shaft to a gear in the engine control.

• The generator is cooled by the engine coolant circuit.

• The voltage regulator cannot be replaced separately. If a repair is necessary, the entire generator must be replaced.