Charging System Warning System
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1991 GMC Pickup, 1991 GMC Cab & Chassis, 1991 GMC C3500 HD, 1991 Chevrolet Pickup, and 1991 Chevrolet Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Warning system consists of a battery symbol warning light on instrument cluster/panel. One side of warning light bulb is connected to alternator field circuit and other side of bulb is connected to ignition power circuit. Warning light illuminates if charging system malfunction is detected.