Why Does My Battery Light Come On and Go Off? | all about cars

Why Does My Battery Light Come On and Go Off?

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One of our readers asks why does my battery lights come on and go off? this happens while driving the car suddenly the battery warning light starts to flickers or is come on and go off occasionally. If your car encounters the same problem it means there is problem with the alternator.


Slipping alternator belt or failing alternator is more likely the reason why battery warning lights come on and off.  You know, alternator does two things first is to charges the battery, second is to provides electricity to power all of the car electrical accessories when the car engine is running, such as headlights, brake lights, car stereo, car air con and others.

The Alternator is a belt driven device that sometimes the belt is occasionally slip, if belt slip the alternator will not generate electricity to charge the cars battery at the same time to power car accessories thereby making battery warning light to come on and off occasionally.

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Also if the alternator occasionally fails, same thing happens it will not generates electricity for sometimes which also cause the battery warning light to came on and off occasionally, Another possible cause is when the alternator wiring harness becomes loose it can cause the battery warning light to flicker but this is very rare to happen.

What to do?
In any case, take the car to a reputable repair shop, ask the mechanic to check the alternator and alternator belt, just hope that the problem is the car alternator belt which can be fixed by simple adjustments or replacement if necessary, or else it will cost you a lot if it’s the failing alternator that causes the battery warning light to flicker. Anyway, car alternator can be repaired and it is much cheaper than buying a new one.

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