dead battery Alternator???????? [Archive] - Toyota MR2 Message Board

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I had not started my 2 since mid fall (summer driver only) and the six month old optima yellow top battery was only putting out 9 1/2 volts hardly enough to start the 2. After charging it back up to 13 i set it back in the car and she turned right over. Then I used my volt meter and found (with the car off) my the volt went from 12.8 to 12.7 to 12.6 and so on. Now with the car on I