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Message: <blockquote data-quote="CC&#039;S95GT" data-source="post: 981265" data-attributes="member: 10547"><p>Alternators, being electrical, sometimes don't act up till they get hot or vice versa.The voltage regulator in inside the alt. is dieing. That's why the light goes off above 3k rpm's. What is the voltage out above 3k?Do you have a multi meter or just going off the autozone test?The belt tensioner may be the culprit too but I doubt it in this case.Todays cars with all the electronics act wierd wothout a properly working alt and batt.Fix the charging issue and I bet the surging idle will go away.</p></blockquote><p></p>