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No key?

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Tractor starts normal, but can't turn it off with key all of a sudden. Can take the key right out and tractor stays running, then I have to choke it out to stop engine. Wiring issue?

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Make sure the circuit from points to ground has continuity. The switch works by grounding out the points. If there is a break in the line then it wont ground it out.

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I'd start at the connection tab at the top of the points cover. With the engine running, ground that connection; the engine should lose spark and stop.  If it doesn't, the wire from that connection to the magneto is open.   

If the engine shuts down, then the issue is between the connection point and ignition switch - no ground from the switch.

Ignition switch case might not be making good ground to the frame, the switch itself might be broken and not connecting the switch pin to ground, or the wire from the switch is open.

First step should be to remove the connector from the back of the ignition switch and clean up the connectors. Check the switch and the wire from the switch to the connection tab at the points cover for continuity.  

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