How do you replace alternator belt on a 1992 Volvo 940 gl sedan?

To replace the alternator belt on a 1992 Volvo 940 GL sedan, first, disconnect the negative battery terminal to ensure safety. Loosen the alternator mounting bolts and the tensioner bolt to relieve tension on the old belt. Remove the old belt and install the new one, ensuring it's properly aligned on the pulleys. Finally, adjust the tension by repositioning the alternator, tighten the bolts, and reconnect the battery terminal.