1996 GMC Savana Van Owner's Manual - Page 113

Voltmeter When your engine is not running, but the ignition is on (in the RUN position), this gage shows your battery's state of charge in DC volts. charging system is not able to provide full power at engine idle. As engine speeds areincreased, this condition should correct itself as higher engine speeds allow the charging system to create maximum power. You can only drive for a short time with the reading 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 as soon as possible. 9 h u 19 VOLTS When the engine is running, the gage 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 in the vehicle and the engine is left at an idle for an extended period. This conditi.on is normal since the Electronic Road-Speed Governor (Gasoline Engines) This optional system automatically controls vehicle top speed. Thesystem controller receives a signal from the vehicle speed sensor and reduces power when the vehicle speed reaches the maximum 65 mph (105 km/h) governed speed. 2-55