How do you change the alternator on a 2004 GMC Denali XL?

To change the alternator on a 2004 GMC Denali XL, start by disconnecting the negative battery cable to ensure safety. Remove any components obstructing access to the alternator, such as the air intake duct or serpentine belt. Next, unbolt the alternator from its mounting bracket, disconnect the electrical connectors, and remove the old alternator. Finally, install the new alternator by reversing the steps, ensuring all connections are secure before reconnecting the battery.