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Message: <blockquote data-quote="basshead442" data-source="post: 7511040" data-attributes="member: 623103"><p>I had the same issue with a HO alt I had rebuilt but by another company. It is the pulley and the reason you need a smaller one is because when they made the alt to have alot of amperage output it makes it to where you have to spin the alternator faster to get the proper output because there are so many more windings than a stock alt and to spin the alternator faster at idle rpm you need a smaller pulley to make it spin faster and charge at idle.</p></blockquote><p></p>

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