Running a converted alternator

jonnyrose said

I changed out my alternator gauge with a voltage gauge from a 1985 truck,

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If the guage you have added is a Voltage guage then tie the two wires from the old Amp guage together and tie them to the + side of Volt guage.
Tie the - side of the volt guage to ground. BE SURE the "Volt" guage is really a volt guage.