The problem with a 6 volt system and a converter to 12 volts is the current limits. To get a dc to dc converter that would supply 15 amps would be some big dollars. You can run a Radio, I pod, GPS and other low power stuff but the fan motor will be too much load. It might be cheaper to convert to 12 Volt or buy a 6 volt fan motor. The conversion to 12 volts is rather simple. But it does mean lights, regulator if you go with a generator, Voltage reducer for the gas gauge and a ballast resistor for the coil and points. A battery will cost about 100 dollars so even that is not a cheap alternative. If you plan on converting any way, start getting the bits together and talk your way into a garage. Beer helps
