1994 Chevrolet Astro Owner's Manual - Page 119

The charging system light willcome on briefly when you turn ignition the on, but the engine is not running,as a check to show you thelight is working. Then it should go out once the engine is running. If it stays on, or comes on while you are driving, you may have a problem with the electrical charging system. It could indicate that you have a loose accessory drive belt, or another electrical problem. Have it checked right away. Driving while this light is on could drain your battery. The charging system light is onthe left bottom corner your standard of cluster. Itis part of the digital cluster voltmeter. If you must drive a short distance with the light on, be certain to turn off all your accessories, such as the radio and heatedair conditioner. 2-59