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Hi,
I have been experiencing battery drain issues when I “dead” lock my car. After a week the battery goes flat. The battery is 2 years old and the alternator charges the battery to 12.6v after a long drive. I have been leaving the car in my garage unlocked and there were no battery issues. This then leads me to conclusions that it might be the door sensor/ lock mechanism. The drivers door lock module was replaced recently - would this be the culprit? Any help is appreciated
 

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How old is the alternator? I had to replace my alternator in my 2008 Rabbit with 142K miles on it. The battery was tested OK but the voltage was barely above 12v and I had mysterious intermittent instrument panel lights, in addition to my cruise control not turning on occasionally. After replacing the alternator, all was good. While I was at it, I replaced belts, pulleys and tensioners because this is not an easy job. I had a professional mechanic do it.
 
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