Your batt should not be bad from just sitting, If you were running the car with a bad alt. it will drain it, not sitting. If you have a draw on your system you will see a voltage drop over a day or so. To check for a draw, get a test light, make sure everything is off on the car, lights, inside lights ect. Unhook the negitive side of the batt and hook up the test light inbetween the battery and the negitive wire, if the test light, lights up with everything off, you have a draw on the system. To help locate the bad system start unpluging fuses, when the light goes out you have found the area. Sorry this is so long, hope it helps!
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