How do you change alternator belt on Fiat seicento?

To change the alternator belt on a Fiat Seicento, first, disconnect the negative battery terminal for safety. Loosen the tensioner pulley by turning its adjustment bolt, then remove the old belt from the alternator and other pulleys. Place the new belt around the alternator and other pulleys, ensuring it is properly aligned. Finally, adjust the tensioner to secure the belt, and reconnect the battery terminal.