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My 320 wagon was completely dead Sunday morning after running just fine for the few days before including a 330 mile trip. Got a new battery. Car started up fine but Monday morning was totally dead again. It can't be jump started. I just makes a loud clicking sound whe you try that. It's got 130,000 miles. Any ideas?
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Could have been barely charged when you bought it. I'd try to charge it and see if it will pass a load test. If the battery is good, you wire an ammeter in series to check for draw. It takes a while for everything in the car to fall asleep, so your readings won't be accurate for 15-20 minutes. If there is over a 30 mAmp draw, start pulling fuses one by one and see if there is a change in your reading. If there is, that's the circuit you check for a draw.
 
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