OK, so I have a Farmall A where the tractor has no lights but still has the 4-position charge control/light switch on the dash. I also have a 3-terminal box on top of the generator with one tower inside with the GEN and BAT terminals at opposite ends. The F terminal on this box seems to go nowhere unless hooked to ground through that resistor shown on the photo in which case it would go to ground if hooked up. What harm is done if the field circuit is wired from the generator case field post to the light switch? Even with no lights, then I would at least have the first two positions of the switch to control battery charge rate (which I wouldn't have if I went through the F terminal on the relay box) .... is that right?
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