If any problem comes in alternator, the battery indicator light will light up in cluster after starting the car and off until you check the alternator.
1.Is battery light is glowing after starting the car or not? It will show that any problem comes in alternator?
2.Is battery indicator is light up when you open the switch and should off after starting the car immediately?
The Failure of alternator would stop the charging of battery and battery suck by continuous ignitions.