Battery light goes on at about 4.5k rpm. - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 6 Old 03-29-2002, 01:29 AM Thread Starter
 
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Question Battery light goes on at about 4.5k rpm.

Was going at it wiht a Honda S2000 when i noticed around 4k-4.5k rpm my battery light went on and the lights kind of dim. anyoone knows what this can be?

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post #2 of 6 Old 03-29-2002, 12:07 PM
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how old is your alternator? What condition is your drive belt in?

could be either of these. if the belt is fine, your alternator might be showing its age.


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post #3 of 6 Old 03-31-2002, 01:58 AM Thread Starter
 
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i just got a brand new atlernator 130amp, its not a rebuild i made sure. but the things got worse today my battery died completely i cant even start the engine. the belt bends real easy i think it barely gets eny friction to the pullies. i am gonna try to buy a new belt tommorow and see if it starts to charge my battery.
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post #4 of 6 Old 03-31-2002, 12:46 PM
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sounds like your belt is slipping cause it is too loose/wrong size?
let me know what happens after you change the belt

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post #5 of 6 Old 03-31-2002, 01:09 PM
 
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Definitely fix the belt / tensioner problem first.

There is another problem I've seen though. I work in a plant that rebuilds alternators so I've seen this first hand... Some of the 3G alternator rotors have problems with the windings either opening or shorting at high RPM on the final testers. They test fine at low RPM, fail at high RPM, and when you slow them back down, the problem goes away.

Where exactly did you get the alternator?
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post #6 of 6 Old 03-31-2002, 03:17 PM Thread Starter
 
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i got my alternator from PA performance i believe they guarantee their alternators are not rebuild. right now even if i jump start the car it doesnt help, after couple of seconds it dies. after couple of seconds of taking of jumper cables the thingn dies. i dont understand realy, i changed to a shorter cable which i barely got on still same thing. can it be my battery? i mean my previous alternator made sounds before dying this one didnt.
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