Unsure?

Read the voltage at the coil lead. Since there are both six and twelve volt front mount coils machine could have either and there is no physical way to tell them apart. Best guess is six volt and running with factory resistor from what you describe. If so and if it has been that way for long coil will likely be toast. Do you have fire at the plugs?

Read out put voltage at generator. Should read seven volts or so. Plenty of wiring diagrams in the archives of this board or a pretty good one in the IT FO4 manual. Figure out and post what you have and somebody here will get you on to the next step.

YOur mileage may vary

This voltage 10V would not be correct, although I would suggest that measuring across an open switch is NOT valid because the meter draws current and you are just measuring your meter.. but it is high impedance and you should be very close to Battery 12.5 V or if 6 Volt Battery 6.5 Volts.

The 10 Volts indicates that current is flowing in the circuit and with the points open NONE
should Flow.

JMHO

If the twelve volt battery is a new good brand battery it might be worth doing a correct twelve volt conversion now. Although I am generally against converting to fix troubles you can buy an alternator for about what a six volt battery is going to cost you. I did a twelve volt conversion on a 2n that got burned over in the Maudlow fire only because it turned out cheaper than fixing the six volt system.

On the other hand, the priceist part is the generator and if it makes voltage--also might want to try to motor it since if it motors it will generate; see IT FO 4 manual or post again--then you may want to stay six volt.

Either way you will need to make coil voltage conform to system voltage. Assuming a six volt coil on a six volt system use the ballast resistor. On a twelve volt system with a six volt coil use the ballast resistor and a standard [blue streak] RU 100 dropping resitor in series [like flashlight batteries].

If any of this isn't clear post again or e mail me since like Dell I have "been there; done that; got a t shirt" on twelve volt conversions. Cleaning up some body else's twelve volt mess is no fun but as long as you keep the board up to date somebody will ride to the rescue.

Your mileage may vary

If the twelve volt battery is a new good brand battery it might be worth doing a correct twelve volt conversion now. Although I am generally against converting to fix troubles you can buy an alternator for about what a six volt battery is going to cost you. I did a twelve volt conversion on a 2n that got burned over in the Maudlow fire only because it turned out cheaper than fixing the six volt system.

On the other hand, the priceist part is the generator and if it makes voltage--also might want to try to motor it since if it motors it will generate; see IT FO 4 manual or post again--then you may want to stay six volt.

Either way you will need to make coil voltage conform to system voltage. Assuming a six volt coil on a six volt system use the ballast resistor. On a twelve volt system with a six volt coil use the ballast resistor and a standard [blue streak] RU 100 dropping resitor in series [like flashlight batteries].

If any of this isn't clear post again or e mail me since like Dell I have "been there; done that; got a t shirt" on twelve volt conversions. Cleaning up some body else's twelve volt mess is no fun but as long as you keep the board up to date somebody will ride to the rescue.

Your mileage may vary