Intermittent connections are the hardest to troubleshoot. Always test under load. A simple test light is the easiest and most practical tool to use.
It helps to have an assistant hold the switch to start while testing where you have power and where you don't. Start at the battery posts (the actual posts, not the cable ends). Then systematically start moving the test light to the next connection. Example, across the posts checks good, so move one test lead to the cable end, good, move the other lead to the cable end... And so on until you find where the voltage drop is. Along the way look and feel for hot connections, smoke, discolored insulation, corrosion, etc.
Common failures are the ground cable to the engine or sheet metal, the connections to the amp meter if equipped, the solenoid base ground, fuse connectors.
Just be very careful that the tractor is in neutral and aware it could begin cranking at any time during the test!
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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