The issue is complex but very fixable. There is a direct conflict between two control systems. The tractor charging system was first designed with a operator controlled charge rate consisting of the light switch as a controller. (The lights were not part of this control, just hooked to the same switch shaft) The L low and H high positions, as well as D and B positions, affect the generator output by grounding the field terminal of the gen. (It gets its voltage from the third brush, or the Arm terminal in a two brush) the L position runs the field current through a wire resistor on light switch. In all other switch positions the grounding is direct, allowing full field and max charge. Your tractor now has a voltage regulator on it. This is in direct conflict with the switch for control of output. If originality is desired, and the switch is used, the VR must be removed and the F wire must go to the light switch. (the resistor on the light switch must be good as well, there are two resistors one for dim lights and one for low charge) Better regulation, and battery life can be had with the VR, and then the wire from the light switch must be disconnected. (both ends) This allows the gen to be regulated correctly by the VR. (assumes a good Grounded VR) I would do this and abandon the switch. Jim
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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