Maybe your alternator drive belt is slipping at high revs. Tighten it up a
bit and give it another try or replace the belt altogether. Alsi, I'd put a
voltmeter on the battery with the car running (at idle) and make sure the
alternator is charging the battery adequately. It should show around 14
volts or so. Good luck.
Consider the following also; If the belt is slipping, then the belt
tensioner is bad..serpentine belts tend not to slip that easily. Even with
a slipping belt(unless it is severe) the battery light ought not to come on
at 4000 rpm. As you suggest, check the alternator throughly.
I have replaced the alternator with a brand new one and i also sprayed the
belt with some belt cleaner which should also make it stick better. This did
not fix the situation. Would this mean the belt tensioner is most likely
The belt's not the problem. Think about it. If it turns fast enough at
idle to turn the light out, then anything faster at all won't make it come
on. OH, BTW, don't spray ANYTHING ('cept water for noise diagnosis) on a
belt. It ruins them.
I didn't know so much about the sepertine belt, but at the V belt in most
Chevy's we are agree. I thought maybe the same ting happend with Ford's
sepertinebelt. I have had and seen this problem lots of times in Chevy's.
When you rew. up the voltmeter goes down. Sorry about not been to clear
about it whas the Chevy's V belt I talked about, and wondered about if the
same happened on Ford's Sepertinebelt.
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