1995 Chevrolet Corvette Owner's Manual - Page 122

Voltmeter 7 When the engine is not running, the voltmeter shows the voltage output of your battery. When the engine is running, it shows the voltage output of the charging system. Readings between the shadedareas show the normal operating range. The reading will change as the rate of charge changes (with engine speed, for example), but if the voltmeter reads in either shaded area, and it stays there, you may have a problem with the charging system, Have it checked right away.Driving with the voltmeter reading in a shaded area could drain your battery. If you must drive a short distance with the voltmeter reading in a shaded area, turn off all your accessories, including your comfort controls and audio systems. For numeric gauge measurements, press the GAUGES button on the Trip Monitor until VOLT appears. The number that appears next to the fuel gauge is the battery voltage. 2-79