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Have a Cub Cadet 1440 that runs fine just wont shut off . Any idea where to start on this Ignition switch ?

Locate your manual above & inspect ignition switch & harness plug. Test ignition switch with test light or multimeter to see if switch is working properly. Let us know how it goes, thanks Mark
Inspect all wiring, grounds included, visually & by hand making sure all is tight & secure.

Pull the blower housing off and check the kill wire
Brake on & key off it should be ground
Then go open when you turn the engine on
Some times the wire an fall off & some times it gets chewed throuhg over winter by some unwanted guests