Question about Ford Mustang
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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