I have 1970 40V Mobylette that has no spark which I am tying to fix, but it also has no lights when I pedal (really fast! ) I've dismantled and cleaned the main switch on the handlebar and also checked and cleaned the one in the headlamp shell. If there is an ignition problem (no spark) should the lights work anyway? Is it a separate circuit or does everything have to be working to get lights? Is there a wat to check the generator output using a meter? thanks a lot.