Novice; have an '89 S10 , needs alternator; I see the three bolts on the old one, but don't see how to release tension on the whole belt system.
( Battery show 12.1 volts across the terminals while truck is off, and a bit less with the truck stated; even less with the headlights on ; I cleaned all terminals - alternator is making a high whine , so I assume we can safely say I need a new one ?) Again, how to give myself some slack on the pulley system ?