How do you change the serpentine belt on a 2005 excursion 6.0 diesel?

To change the serpentine belt on a 2005 Ford Excursion 6.0 diesel, first, locate the belt tensioner and use a wrench or ratchet to relieve tension on the belt. Carefully slide the belt off the pulleys, noting its routing for reinstallation. Once the old belt is removed, place the new belt onto the pulleys according to the routing diagram, then release the tensioner to secure the belt in place. Finally, double-check the installation before starting the engine to ensure proper alignment.