I assume you mean you tightened the alt. belt.
Only a loose belt will effect the electrical output of the alt.
An over-tightened belt will ruin the belt, alt. bearing, and the tensioner bearing.
The computer controls the rpm thru the Idles speed control valve, by monitoring various sensors and load conditions.
So first check and clean all the ground wire connections you can find, starting with the battery posts.
If you don't find any obvious problem areas along the way, and it still does it, you may want to have the charging system tested.
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Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing.
TEMS, and some nice MODS. Sold to a friend 10/08/08.
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