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03 GMC Yukon, Battery Not Charging p1637 The "Battery Not Charging" warning & battery light flash on & off as I brake, accelerate & turn corners. I assume something may be loose. Am I correct or should I go ahead & have the alternator replaced?

Vehicle: 2003 GMC Yukon SLT

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You can check to see if something is loose (like battery terminal), you can use a voltage meter to double check the alternator is not charging. 

you can check the alternator connector just to make sure its not a harness problem. If you have getting 5 volts replace the alternator

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