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Two bolts on the alternator, one on top 12mm in the slotted hole, one on bottom of the alternator being a 14mm (just loosen both of them). The one on the bottom is the pivot point. Rotating the alternator will adjust the tension on the serpentine belt. Leave about 1/2" play in the belt. If it squeals later may need a bit more tension. Don't overtighten.
Notice the arm at the top attached to the alternator (the arm with the slotted hole) has a cast bolt midway on the face toward the engine. This makes a nice leverage point for sticking a screwdriver in between this bolt and the alternator (holding srewdriver vertically and pushing forward) for tightening.
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