Brian,
A Farmall A with a 3 pole voltage regulator has the Batt line running to the ammeter, and that same pole of the ammeter runs to the light switch. The other pole of the ammeter runs to the batt side of the starter switch. If you have a 4 pole regulator, which is sounds like you do, run the lights from the L or load or lights pole. That may fix everything. If not - if you turn on the lights with the engine off, and the meter says charging, the ammeter is wired backwards, you have bad or grounded wires, or the ammeter is the problem. If instead with lights on, engine not running and showing discharge, try a separate ground to the voltage regulator or try polarizing the regulator by brushing a wire from the Bat and Gen terminals. If still no go, try jumpering the F or Field terminal to ground. If you still get no charge, the problem is in the generator.
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