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99 Seville STS, 08 STS4 N* 1SG F55
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Read in another post that you used AC Delco replacement alternator so probably not that. I had 3 of Napa's finest rebuilts go toes up in <2 years on my CDV. First lasted 2 days and pulley bearing disintegrated, 2nd went one week before charge light back on, third had bad voltage regulator (lights flickering). Also replaced tensioner pulley for noise at some point. Alternator #3 or water pump #2 - they all run together after awhile. My PS would moan but only when turning the wheels. Early water pump bearing noise? That's another one that bit me in the a$$ for using aftermarket rebuilt junk. Never again.
 
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