5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Fluctuation Battery

Old 04-10-2016, 10:57 PM
  #11  
v8miata
 
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This might be obvious... but while the car is off and no drain on the battery a battery should read between 12.2v and 12.8v

If you are reading towards the lowerside (12.2v) even after a charge and battery sitting for a bit, the battery is getting old and almost shot.
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