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Voltage Regulator 12 volt,, outer appearance exactly like original cut-out, not just a diode but a complete modern regulator, protects generator and electrical system from burnout. Negative ground only., but will allow you to convert your car to use a 12 volt battery and still use a stock Model T generator, 12 volt light bulbs are the only other items needed to complete the conversion, (looks like orig. cut-out)