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Message: <blockquote data-quote="jrwalte" data-source="post: 4696171" data-attributes="member: 584454">This is a common issue with HO alts. They require a higher internal (within the alt) RPM than a stock before they can start giving power to your system.  I'd contact Iraggi about replacing the current pulley on your HO alt with a smaller one to give the alt a higher internal RPM. Hopefully he can make one small enough to run at your car's idle RPM.If not, another option to look at is getting the smallest pulley you can and then increase your car's idle to the point where the alt will kick on. If you don't sit in traffic much you won't see a big difference in your MPG.</blockquote>

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