You need power to the solenoid also while starting or you get no gas. It needs to be powered at all times when starting and running then no power to shut it off. The Diode handles this issue. As long as you’re using a key switch it’s probably the best way to deal with it. On my 1210 I had long ago junked the Cub wiring harness and installed a toggle switch and a push button for the starter so when I did the re-power in my 1210 I just ran a wire to the solenoid that has power in the run position. Not suggesting you do it my way because my tractor has none of the Nanny State mandated safety switches.
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