Bought a Cub Cadet garden tractor with a known problem that prior owner could not figure out. It would run OK sitting still but would miss and back fire when moving. Fooled with it a while but had not figured anything out. Choke cable was froze up when I bought it but I reached up and choked it at the carburetor. Got tired of that so I put a new cable on it. Second time I went to start it the new cable was stuck, dang &*%China junk!. Bought another new cable and installed it and second time I went to start it that cable was stuck too. Gave up on choke cables but continued to fool with the tractor now and then. One evening I had it in the driveway running and it was missing sitting still, Wife comes out (who knows ding about mechanics) and yells why is it sparking down there?? Down where I asked? She points, right there! Where the choke cable passed through a hole it was sparking. I held it against the hole and tractor quit missing, then moved it away so it wasnt touching and tractor died. Choke cable sheath had become the ground due to bad ground between engine and frame. It was fixed with extra ground wire. Question still remains why did the starter work OK with limited grounding but not ignition system??
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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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