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Old 02-21-2017, 05:25 PM   #3
JerTM

 
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Drives: 2011 2SS/RS M6
Join Date: Oct 2015
Location: Utah
Posts: 1,940
The tuner doesn't adjust any part of the alternator output or battery. I would check to make sure all your grounds are good then have the battery tested. It's possible that the key was just left on and forgotten about.
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