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Are there any other issues with the vehicle? Does everything else work? This is an ammeter, and C and D stand for Charge and Discharge. If they don't move at all, under any conditions, that should mean that no power is flowing through the gauge. That should also mean that most or all systems don't work. Turn the headlights on with engine off and the gauge should move toward Discharge.
It could also mean that someone wired around it, as they were often troublesome. Might be best and easiest to install a voltmeter.
It could also mean that someone wired around it, as they were often troublesome. Might be best and easiest to install a voltmeter.