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Have a bad alternator, how to replace

(1990 Chevrolet G Series Van (G10))
in Reno, NV on February 20, 2011
I need instructions for replacing an alternator on my van. I understand it has a belt tightener which can a little tricky and dangerous to work with. Once I replace the alternator, what is best way to retighten the belt with the belt tightener? I am pretty sure that the engine size is 5.7 liters.
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