How do you replace alternator 2004 Audi a6 quattro?

To replace the alternator on a 2004 Audi A6 Quattro, first disconnect the negative battery terminal to ensure safety. Remove the serpentine belt by loosening the tensioner, then disconnect the electrical connections to the alternator. Unscrew the mounting bolts to take out the old alternator, and install the new one by reversing the process. Finally, reconnect the battery and check the operation of the alternator.