[header] How to respond when your car's battery light goes on [title] Resist the urge to panic. [step] When your battery light comes on, it sometimes results in a very simple solution. [title] Look at your gauges. 
[step] Check the gauge that indicates the vehicle's state of charge, called the voltmeter (be aware that not all cars have this gauge). Often, this gauge has a picture of a battery on it.