Alternator issue - Mustang Evolution

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Old 09-09-2012, 09:23 PM   #1
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I've noticed that when my car is idling my alternator gauge will fluctuate and sometimes almost die and then idle up on it's own. But it does not consistently do it. That's without the A/C on. What could cause that?

The alternator is brand new. Just put it on two weeks ago.
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Old 09-09-2012, 09:31 PM   #2
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Underdrive pulleys???
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Old 09-09-2012, 09:41 PM   #3
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Touch a meter on the batter while running. It should be over 14, is it the stock size alternator and any add ons. Amp, electric fan etc..?
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Old 09-11-2012, 09:57 PM   #4
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Quote:
Originally Posted by 90GTNovi2000
Underdrive pulleys???
Would that cause the problem? Do they wear out? I know they are on there (I've only had the car for a few weeks).

I'm new to the sports car world. Finally got my first mustang I've always wanted.
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Old 09-11-2012, 10:01 PM   #5
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Re: Alternator issue

Sounds to me that you have an idle speed issue, not an alternator issue. The gauge will move if the idle speed drops.
There is a link to resetting the idle speed in the Useful Info sticky thread.
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