I want to either modify a lawnmower engine magneto or wind a new one that will produce an output voltage of 12 volts at a current of 1.5amps at the point that the normal magneto would produce the 20,000 volt spark. I will be using this output to close a relay an apply a 110volt A/C, 20 amp current to a heavy duty coil which will cause a 40,000 volt spark at the plug with a current of 6 amps. I need this magneto as a timing device to close and open the relay. I thought I might be able to just reduce the number of windings on the secondary of the current magneto, but it is all encased in goop and therefor cannot be broken down. The magneto is on a laminate E frame which I have managed to salvage, but now I need to know how many turns I need to wind for the primary and secondary to have an output of 12 volts. Anyone have any ideas ?