Assuming this is regarding yesterday's post. Is it still wired same as those pictures? Is the gray wire from the L post on the regulator the same gray wire that goes to the bottom resistor in the picture with the light switch.
If so there is your problem. The L post from the regulator is "Load" and feeds the lights and the ignition in tractors having a distributor.
If wired as assumed above, the resistor is the regulating resistor that would go to F post on the generator when using just a cut out instead of a regulator. A regulator controls the field automatically and does not use the High Lo side of the manual switch.
If my above analysis is correct, disconnect gray wire from the light switch, use it to feed input to the switch and use the switch only for lights.
When you put the manual switch in Hi position you are putting a dead short on the regulator which will load the system, cut voltage to the lights, cause ammeter to show severe discharge and make heat and smoke.
When the F terminal on regulator is connected to F post on generator there should be no connection to the bottom resistor on the switch.
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