On eBay there is an auxillary coil that goes on the backside of the magneto in the space that's left. It hooks in series with the white wire to give you 12 volts. I'd recommend a voltage regulator(which the same company has)to smooth the power out. Mine came with a battery pack of AA batteries but I went to a sealed lead acid battery. If you watch eBay you can get a real good battery shipped for under $20.