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[email protected] as have a lot of information about bulbs, electrical etc.. I have a 12V negative ground system using the original generator and replaced the 6V battery with a 12V battery. The battery is the load that sets the voltage. You can use a dropping resistor for the horn. I also installed a relay for the horn. Have the Bendix mentioned above on the starter. Have converted the tail lights to LED as they are brighter. Use the 50/32 candle power headlights. There are LED headlights, but do very little driving at night so have not converted.