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Battery light on dashboard on, inspite of changing battery and alternator being checked ok

Tiny
HAPPENING6
  • MEMBER
  • 1998 MERCURY MYSTIQUE
  • 201,000 MILES
So I noticed a battery light and got a free diagnosis at autozone and walmart. They said the battery cell has gone bad. I got it replaced yesterday at walmart, but still the battery light remained on. THey checked my alternator and starter and they both are Fine. They did not know why the light is on. I have changed my alternator 3 times in past 5 years.
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Saturday, April 13th, 2013 AT 6:06 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It sounds like the alternator has failed again.

Check voltage at battery with the engine running. It should be 14 to 14.5 volts

Roy
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Saturday, April 13th, 2013 AT 6:27 AM
Tiny
HAPPENING6
  • MEMBER
  • 3 POSTS
Thanks Roy. However, I got my alternator checked 3 different places( walmart, autozone and advance auto), all of them checked in off and engine on position and said that the alternator is fine. Do you still think alternator has to be replaced? And how sooner does it have to be replaced. Can it last for a couple of weeks.
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Saturday, April 13th, 2013 AT 6:46 AM
Tiny
HAPPENING6
  • MEMBER
  • 3 POSTS
I just got it checked again, the alternator voltage is 14.38V (no load) and 14.39V (loaded)
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Saturday, April 13th, 2013 AT 7:00 AM

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