Classic Engine Tech 1967 - 1981 Engine Related

alternator pulley info help needed

Old 04-19-2011, 11:18 PM
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alternator pulley info help needed

I have an alternator that only charges the batt at around 2000rpm. At idle my volt gauge reads 12V and at 2000rpm it reads 14-14.4V.

It has a really big pulley, but if i change to a smaller pulley will it fix it so it charges at idle? Or will it just blow the alternator and i should replace it?
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Old 04-21-2011, 04:10 PM
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Re: alternator pulley info help needed

bump de de bump
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Old 04-22-2011, 09:51 AM
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Re: alternator pulley info help needed

Originally Posted by 67speeda View Post
I have an alternator that only charges the batt at around 2000rpm. At idle my volt gauge reads 12V and at 2000rpm it reads 14-14.4V.

It has a really big pulley, but if i change to a smaller pulley will it fix it so it charges at idle? Or will it just blow the alternator and i should replace it?
Alternators are not efficient at idle. Putting a large pulley on, will make it less efficient. Many hot rodders recommend that you Do Not put an underdrive pulley on the alt. for this reason.
Yes, replacing the over size pulley with a smaller one(stock) will help with your low rpm charging.
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