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The battery controls the voltage of the system . As long as it remains positive ground no wires will need to be changed . All that will be necessary is to first install a 12 volt battery and connect it positive ground . It will be necessary to either install a resistor at the coil connection if a six volt 1.5 OHM coil is used . I prefer to use the more powerful 12 volt three OHM coil with a built in resistor for a cleaner setup that still appears original . If negative ground is needed it will first be necessary to connect the battery negative ground . The coil wires will need to be reversed and so will the wires at the ammeter . I almost forgot but if the system will be 12 volts , the bulbs will need to be changed and a resistor may be needed at the horn and electric windshield wiper motor if used .