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Volt gauge on 91 not working.

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First test the gauge. It's held into the cluster panel with two screws and it has two terminals, which should be marked. Disconnect the vehicle battery to be sure you don't get zapped (although you shouldn't if the ignition is off). Take a pair of 9-volt transistor batteries, wire them in series to put out 18 volts, and touch the output leads to the terminals on the back of the voltmeter to see if the needle moves. If not, you need a new gauge. If so, check for continuity where the screws connect the gauge to the printed circuit.

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