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2009 GMC Acadia

  

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My headlights flicker when it misfires could the battery be the issue? Or something else


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No. Batteries don't really flicker. But it could be the battery terminals. Make sure all connections are clean and tight. Otherwise it might be the alternator.


I heard taking one of the battery post off while the car is running and if it dies then that means the alternator is bad and I done that and it still kept running


That's is pretty much the worst way to check an alternator. Doing that is a great way to finish it off.


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