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Message: <blockquote data-quote="jrwalte" data-source="post: 4536452" data-attributes="member: 584454"><p>AH.  Your HO alt may be fine.  Your pulley may be too large and your alt isn't getting the rpm it needs to create decent amperage at your car's idle.  Some HO alts won't even start giving amperage until a certain internal RPM is reached. It's a common issue with HO alts.  I'd contact the company you bought the alt from and talk to them about a smaller pulley. You want to make sure you get one that they support or you could over rpm your alt and damage it.</p></blockquote><p></p>

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