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2007 cts 2.8l, put new battery in,cranked and was watching voltage on communication screen drop from 12.1 to 9.3 in just a couple minutes and was still goin down. dropping that fast just idling,it couldnt be the alternator could it?if it was bad the battery wouldnt drain that fast would it?any ideas
 

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2007 CTS 3.6 >130k miles
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641 Posts
I should have mentioned...do not get a parts store brand...get an ACDelco or Denso. I am on my 4th carquest and it is about to go back to the store (again). These are not easy to change.
 
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