My 2006 Ford Mustang worked really well for the first 56,000 miles but now the battery seems to die all the time. If I let it sit for too long, any more than a day and a half, it would need to get a jump to start. The battery has been replaced recently and it was fine when the shop tested it. The alternator is working as well. Something has to be using power when the car is off, but I have no idea what it is. How would I even go about finding out what the problem part is?
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