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Old 07-15-2014, 10:28 AM   #6
Join Date: Apr 2014
Vehicle: 67 mustang coupe
Location: PA
Posts: 43

Sounds like a bad cell in the battery. How old is it? If it is a year over warranty, then it is probably shot. Lead drops out of the plates and falls to the bottom of the cell. Eventually it build to the point where it will short the cell. idling at 11.5 volts means that there is a load on the system which translates usually to either a short, heavy usage such as lights and AC or a bad cell.
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