Here's another approach. Turn the ignition on. Then jump a wire from the hot battery terminal straight to the coil input terminal. Crank it over and see if it starts. If it starts, remove the jumper wire but leave the ignition on. If it continues to run wiggle wires between the ignition switch and the coil while it is running and jiggle the ignition switch too. There might be a resistor between the ignition switch and the coil with no bypass wire or the bypass isn't working.
A neighbor had a 656 that was hard starting after Pertronix was installed. He messed with it for several years but it always started hard especially cold. One day I was using this tractor and decided to investigate. The resistor between the ignition switch and coil was still hooked up and there was no bypass wire going for starting purposes. I bypassed the resistor, shooting 12V to the coil full time and it popped right off. That was five years ago and it's still going strong.
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Today's Featured Article - Talk of the Town: How to Crank Start a Tractor - by Staff. This interestin discussion is from the Tractor Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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