I have seen them installed right off of the shelf and be bad.
Reason for them there warranty's, 'round here, two months would be a free replacement! (PROVIDING IT IS THE BATTERY)
Change the battery and run it to the auto store for testing (Which should include the alternator, still on the vehicle, too!)
or
You can check it yourself, here is a link!
https://www.2carpros.com/articles/how-to-check-a-car-alternator
Return with good news!
The Medic
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Monday, October 10th, 2016 AT 3:52 PM