Weak Alternator

courtesy of Bob, The Auto Answer Man

Dear Bob,
I think I have a problem with my alternator. When I am driving, my voltage meter stays at or a little above 13. When I am just idling like when I start or stop at lights, it goes down to maybe a 9 or even a little less. AutoZone told me that my battery was okay when they checked it for me. I was also told that if it was an alternator going bad, it would have done it already. It has been doing this for a couple of months.

It could be getting weak. The alternator needs to spin at a minimum speed in order to make the correct voltage. Since you are noticing the decrease in voltage, it sounds like it's on its way out.
Good Luck!
Drive Safely!
Bob, The Auto Answer Man

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