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post #1 of (permalink) Old 08-10-2001, 04:54 PM
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Battery light

Does anybody elses battery light come on at around 4000 rpm, cause mine will. Is there a way to prevent this, or do I have something wrong with my motor. I have a '91 350 tbi.

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post #2 of (permalink) Old 08-10-2001, 07:05 PM
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Re: Battery light

Ive got an 89 and never noticed this.
But I dont have a tach so I couldnt tell you if its reacing 4000. wish I had your gauge cluster though.

Id think somethings alittle screwwy but I have no clue what it would be.

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post #3 of (permalink) Old 08-10-2001, 07:32 PM
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Re: Battery light

the alternator might be going out. Maybe the belt is slipping. Get a buddy to give it some gas while you probe the charging system with a meter. Does the voltage drop too?

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post #4 of (permalink) Old 08-10-2001, 07:52 PM
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Re: Battery light

Somebody else suggested that maybe the belt was slipping. if so, what can I do about that?

post #5 of (permalink) Old 08-10-2001, 11:25 PM
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Re: Battery light

grab a new belt, and maybe a new tensioner - if that doesn't fix it I would focus on the alternator.

post #6 of (permalink) Old 08-11-2001, 01:08 AM
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Re: Battery light

More than likely it's the internal regulator going out in your alternator. I have gone through 6. What's more than likely happening is that in that higher rpm band, the regulator has to discharge alot of heat because it's producing alot of power but can only allow 14.4 volts out. So, since it's wearing out, it can't handle this heat and it shuts down. Your batt. light won't come on unless there is Zero or close to it output of the reg.

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