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.
Bob, The Auto Answer Man
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