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Old 04-16-2011
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Battery light

I noticed my battery light comes on whenever I hit about 4K RPM's but then goes off after it drops below 4K. I think it may be something to do with my alternator. I have no dim lights or anything abnormal that would be due to an alternator going bad though. Battery is new. 05 with 72K miles. Any other ideas?
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Old 04-16-2011
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It's called brush float . The springs on the alternator brushes are just weak enough so the brushes lose contact at high rpm.
Either keep it under 4k or install new brushes.
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Old 04-16-2011
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My factory alternator did that exact same thing. Eventually took a dump on me right outside of warranty age (inside mileage though, only had around 30,000 miles).

Squirrel some money away for a new alternator in the future. IIRC, a remanufactured one cost me $110 a couple years ago.
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Old 04-17-2011
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Thanks for the input guys. Im sure if I dont do anything about it it will eventually go out on me so I think im going to replace it. Figures my extended warranty just ended a few months ago.
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Old 04-17-2011
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Just looked at it and it looks like it will be pretty easy to change. Now im not sure what amp is in there right now and I see there are 90, 95, 115, and 130 amp alternators available. Which one would be stock?
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