why does A/C on max cause battery to pull heavy on the battery

Asked by Jun 30, 2013 at 10:06 AM about the 1989 Ford F-250 XLT Lariat Standard Cab LB

Question type: Maintenance & Repair

when i turn the A/c on max and fan on full..the battery gauge shows battery not charging and the engine will stop if changing from reverse to drive ??

2 Answers

Alternator. They don't necessarily fail all at once, but can get weak. Suggest you have it tested.


the chances are bigger that the battery will run out if the car is not moving and spot lights or AC is ON on high! otherwise replace your battery with a stronger version 1

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