This is what I have done, not knowing the issue with positive ground. The car is 6 volt neg ground. I installed a new battery, coil, points, condenser, plug wires and plugs. The car seems to start fine however the battery has a hard time cranking over the motor. I assume this is typical 6 volt issue. Taillights work, no brake lights. Headlights do not work and no turn signals. Amp meter is stable, heater fan works, fuel gage is all over the place, oil pressure is around 40, radio does not work.
My first thought is a ground problem however I do not understand positive ground impact on those items not working.