Thank you for your prompt response. The Farmall A is running, again. I cut off the slightly frayed end of the field wire and crimped a new end to it before plugging it back into the regulator. The tractor started like a charm. After I "killed" the engine with the magneto, there's still a slight cloud of smoke at the field wire, but it dissipates immediately. For now, I keep the negative ground disconnected at the battery when tractor not in use. Do you still recommend a 2-terminal NO oil pressure switch to be installed to prevent battery drainage when tractor is not in use? Based on how the tractor is configured, is there potential, parasitic drainage of the battery that I need to prevent? Thanks again for your advice and wiring diagrams.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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