Light Inoperative
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.
- Turn ignition on. Check for burned-out bulb. If bulb is okay, check for open in Dark Green wire from cluster connector A14 to ground terminal of ignition switch. If wire is okay, check for voltage to bulb socket.
- If voltage is NOT present, problem is in coolant temperature gauge circuit board power circuit to CHECK GAGES light driver. Repair/replace temperature gauge and circuit as necessary. Light driver is an integral part of coolant temperature gauge circuit board. Replace defective instrument cluster if necessary.