Question about Ford Mustang

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When I'm idling in an Atlanta traffic jam yesterday the battery gauge gets very low, the radio turns off and I'm afraid battery is dying. Coming out of the traffic jam and returning to highway speed the battery recharges. Is this the alternator, battery, something else?

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  • Anonymous Aug 16, 2008

    In six months I changed three alternator, every time voltage is low so I changed the alternator and battery

  • jmb2005 Jan 20, 2009

    I put a new battery in my 1999 Ford Explorer about a week ago. Then when I was driving to work, the lights dimmed, CD player shut off, and battery gauge dropped significantly. This only lasted for about 5 seconds, then everything came back on again, and battery gauge was on the rise. Tested alternator, battery and starter at two different Auto Parts stores. They said I didn't need a new alternator and everything was fine. It was tested at well over 14 voltz running with everything on; and well over 12 with truck shut off. This was a day and a half ago. Now, its been tested again, and shows only 10.0 voltz with the truck shut off. Does anyone know what this could be? I'm in desperate need of help. I just bought this SUV from the dealership, and gave them my 2003 Mustang.

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It sounds as if the alternator is not putting out enough charge at idle to keep the car's battery at minimum necessary voltage levels. When you drive, the RPM are higher and the alternator spins fast enough to charge the battery. At idle speed, the output from the alternator isn't enough to replenish the battery's charge. Find out whether you have a separate voltage regulator, or if it's built into the alternator (they often are). I think you're looking at a new alternator though. You could go to an auto parts chain store and have a charging system test done to see if everything is OK - at AutoZone or Advance Auto Parts, they'll do it for free - it'd be worth the time to have them do that, to see whether it's the battery or alternator, or neither.

Posted on Jul 27, 2008

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