1995 Chevrolet Astro Owner's Manual - Page 115

Voltmeter Standard Cluster Digital Cluster VOLTS When your engine is not running, but the ignition is on (in the RUN position), the gageshows your battery's state of charge in DC volts. When the ignition is running, thegage shows the condition of the charging system. Readings between the low and high warning zones indicate the normal operating range. Readings in the low warning zone may occur when a large number of electrical accessories are operating the vehicle and the engine is left at an in is idle for an extended period. This condition normal since the charging system is not able to provide full power at engine idle. As engine speeds are increased, this conditionshould correct itself as higher engine speeds allow the chargingsystem to createmaximum power. On the digital cluster, a box around the voltmeter symbol will begin the flash when the charging system needs service. You can only drive for ashort time with the readings in either warning zone. If you must drive, turn off all unnecessary accessories. Readings in either warning zone indicate a possible problem in the electrical system. Have the vehicle serviced soon as possible. as 2- 61