Voltmeter Test
WARNING: This page is about a different car, the 1995 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition on. Observe voltmeter. Turn headlights on. Set heater blower fan to HIGH position. Voltmeter pointer should move toward lower voltage. If pointer does not move, ensure fuses are good. Inspect wiring between battery and instrument cluster. If connections are secure, remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Test for battery voltage at instrument cluster. If battery voltage exists, replace gauge.