2001 Ford Mustang battery keeps dieing

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2001 FORD MUSTANG
6 CYL
2WD
AUTOMATIC
69,000 MILES

2001 Ford Mustang mileage: 69,000. My son's car failed to start after school on Friday even though it had run fine that morning. We jump-started it thinking he had left something on. We took battery to get charged and they suggested new battery so we bought one and put it in. The car immediately cranked, but after setting overnight without driving the car for more than a few minutes, it was dead again this morning. Nothing has been left on to run the battery down, and I thought it might be the alternator, but since we didn't run it, yesterday I didn't see how it could have pulled all of the juice out of the battery if it was alternator.I feel like something is running the battery down, but don't know where to begin to look. Any ideas?

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4,540 POSTS

Here is the procedure we use to isolate a battery drain. Remove negative battery cable from the battery. Using a 12-volt test light, hook one end to the negative battery post the other end to the negative battery cable you just disconnected. The test light will glow or “light” if there is a drain. If the “light or glow” is faint, that is probably normal draw for the clock or computer. If the “light or glow” is bright, then there is a large drain. That should be corrected. Now start removing and replacing the fuses one by one until the light goes out; that one will be the circuit with the drain. Remember to hold in the button in the door jam for the interior lights.