Will the alternator charge the battery if its just idling?
by 
justme32 loves the weekends
ANSWERS: 3
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Yes.
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Usually, but not always. Most vehicles (>95% of them) will spin the alternator fast enough at idle to charge the battery. However there are some with the wrong sized pulleys, electrical issues, design flaws, and/or too low idle speeds to give the battery a meaningful charge while the engine is idling. My current vehicle falls under that category. Every part is within spec when tested, but for some reason my battery will not charge at warm-idle RPM. (Cold-idle is a little higher and actually driving isn't idling unless I'm at a red light, so it isn't a major problem for me.)
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yes it would cause the car runs of the alternator, the battery is just "stored" power so duh it would charge the battery, think about all the electrical things you have running in the car, the stereo ac, heater blower motor computer, headlights I mean duh are you dumb!!!!
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