How do you replace an alternator in a 2006 Toyota Highlander?

To replace the alternator in a 2006 Toyota Highlander, first disconnect the negative battery cable to ensure safety. Remove the serpentine belt by releasing the tensioner, then unbolt the alternator from its mounting brackets and disconnect the electrical connectors. Install the new alternator by reversing the removal process, ensuring all connections are secure and the belt is properly tensioned before reconnecting the battery. Finally, start the engine to check that the alternator is functioning correctly.