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voltage loss

  • 2001
  • 911 Turbo
Mileage: 
64 000
Electrical and Electronic
Bainbridge Island, 
Washington

When the battery went dead about 6 weeks ago. The autoparts store said it was in decent shape, but winter’s coming on and I decided to replace it.  Three weeks ago, the car was dead again. I disconnected the battery, and recharged it. It showed 12.9 volts. I reconnected it, and checked the interior light switches, the doors, and removed then put back in the cd holder for the cd changer. Over the next two weeks, the voltage dropped, about .1 volts a day, with local (< 10 miles) driving each day and with my using the key fob to shut off the interior lights and display at night. It’s gone down to 11.0 volts. The alternator was replaced last year.Thoughts on the cause of the drop, what to do to isolate it?

Thanks!

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