HELP! Batt/Alternator Issue

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rfiltz

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Apr 16, 2002
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Tampa
I replaced the alternator on my 92 MTX last Dec, been running fine since. Today (as I'm planning on taking a long trip tomorrow) my BATT light comes on. Checked with voltmeter and my battery shows 12.33 V at rest. When running the meter reads about 12.07 V both between the terminals and when I check directly on the alternator post.

I'm thinking bad alternator again, but could it be the battery? I thought the Alt was supposed to read like 13.7-14.7 V when car's running?

Edit - it was the Alt. replaced under warranty, but lost a day on my holiday trip!
 

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