1947 3100 with 235 engine and 6 volt system. All of a sudden when I turn on the ignition using the key and press the foot starter nothing happens. My battery is full charge. How can I diagnose this issue? Also not of the gauge indicators (needles) move. I believe one needle moves when ignition is on before start up but not sure which one. I don't believe there is a problem with the starter. Wondering if the key switch needs replacing? I know I am a lot of trouble but thanks to all who offer me assistance. ray durham