Hi Paul Z, It is highly recommended you change back to the original 6-volt system. It probably will not require anything to be changed IF major changes were not made by the previous owner. All the bulbs should still be the 6-8 volt variety and will continue to work fine. When your electrical system is changed back to 6-volt and "fine tuned" you will be a happy camper. 
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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