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Voltage low under acceleration

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Old Jul 12, 2008 | 11:14 AM
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Default Voltage low under acceleration

the car seems to be dropping voltage dramatically under acceleration. I have few stereo upgrades. When running A/C and listening to the radio it drops off quite a bit when i stomp it. It even gets to the point of the ABS inop light popping on and the headunit turning itself off. I've gone through a couple alternators already and am wondering if this is a situation where maybe i should go for a high output alternator or maybe their is another problem somewhere.
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Old Jul 12, 2008 | 11:37 AM
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Ive seen a few alternators decrease in voltage instead of increase in voltage.Its mainly due to a bad alternator. What kind of alternator are you using? I dont see the need for a high output alternator at all. I tried purchasing a few cheap alternators when mine went bad and was forced to purchase a good quality AC Delco alternator that cost me over $300. I tried the cheaper alternatives and replaced 4 within a couple weeks.
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Old Jul 12, 2008 | 01:40 PM
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I am using a stock alternator off another F-body. i thought with the stereo upgrades it was a definite thing to get a high output.
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Old Jul 12, 2008 | 08:28 PM
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How much of an upgrade are we talking?
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Old Jul 12, 2008 | 10:30 PM
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JL 10W7 pushed by a JL 500 amp. another amp powering all the mids and highs. I also have 0 gauge from the red top battery back to the hatch
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Old Jul 12, 2008 | 11:04 PM
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thats not a very stressful system. i would say look for problems elsewhere
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Old Jul 13, 2008 | 09:26 PM
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From: Prescott AR
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Weak belt tensioner or badly worn belt could be the problem.
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