How do you change the alternator on a 2004 mercury monterrey van?

To change the alternator on a 2004 Mercury Monterey van, first disconnect the negative battery cable to ensure safety. Remove the serpentine belt by releasing the tensioner and then unbolt the alternator from its mounting bracket. Once removed, install the new alternator by securing it in place, reconnecting the wiring harness, and then reattaching the serpentine belt. Finally, reconnect the negative battery cable and start the vehicle to ensure proper operation.