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The Terminator
Engine/Tuning
Low battery voltage under load--battery or alternator at fault?
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<blockquote data-quote="TheFleshRocket" data-source="post: 15753969" data-attributes="member: 48535"><p>Yeah, I figured that the test conditions at PA Performance and Autozone probably wouldn't mimic the alternator being spun to 6000 RPM engine speed (not sure how many RPM that would be at the alternator--15K or so?), so I wasn't very hopeful when I reinstalled it--I figured the problem would persist. Fortunately cleaning the eyelet fixed it, but I don't doubt that there are certain people whose alternators might test good but not be.</p><p></p><p>Actually, that reminds me of my recent alternator issues with my '94 Caprice. It was a new Delco Remy 130-amp unit. The original alternator stopped charging altogether, and the new one was just fine... up until 4000 RPM, that is. Then the headlights would go dim and the dashboard voltmeter would drop into the yellow zone. It was consistent, too. Seemed to be based on RPM, though, not load--it would do it even under part throttle. Of course, I never took it to Autozone to have it tested, I just RMAed it to Rock Auto, but I bet Autozone might have said that it was good.</p></blockquote><p></p>
[QUOTE="TheFleshRocket, post: 15753969, member: 48535"] Yeah, I figured that the test conditions at PA Performance and Autozone probably wouldn't mimic the alternator being spun to 6000 RPM engine speed (not sure how many RPM that would be at the alternator--15K or so?), so I wasn't very hopeful when I reinstalled it--I figured the problem would persist. Fortunately cleaning the eyelet fixed it, but I don't doubt that there are certain people whose alternators might test good but not be. Actually, that reminds me of my recent alternator issues with my '94 Caprice. It was a new Delco Remy 130-amp unit. The original alternator stopped charging altogether, and the new one was just fine... up until 4000 RPM, that is. Then the headlights would go dim and the dashboard voltmeter would drop into the yellow zone. It was consistent, too. Seemed to be based on RPM, though, not load--it would do it even under part throttle. Of course, I never took it to Autozone to have it tested, I just RMAed it to Rock Auto, but I bet Autozone might have said that it was good. [/QUOTE]
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Low battery voltage under load--battery or alternator at fault?
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