Hy Colorado51three
quarter, The switch you are describing is a polarity reversing switch, it's purpose was to change the polarity of the power flowing through the points [primary ignition cicuit], it would change the polarity every time the engine was started. Now to your engagement problem, 12 volt starters are not compatable with flywheels designed for 6 volt starters. As long as your engine doesn't require a lot of cranking when starting, your 6 volt starter will work just fine on 12 volts, hope that helps.
