I would need to see it hands on to understand the wiring. There are several safety switches combined into the switch. First, check the 20A fuse. Is the battery charging correctly? 12-14v when engine running. You need mostly 12v to the PTO clutch or it will not stick.
You should have 12V to PTO switch 1(and R on ignition switch) when key is on. You should have 12 v to PTO sw 4 when PTO switch is switched on. If the power gets to the PTO clutch depends if the LH and RH reverse are allowing 12v to pass thru.
Closely check the terminals on the ignition switch and pto switch for corrosion.
I think PTO switch 3 & 6 go to a light bulb on dash and stop engine from cranking if the switch is in the on position.. I think PTO switch 2 & 5 shut down engine if safety switches are not triggerred.
I am not certain without looking at machine but hope that helps. You need to check voltage with a meter, not continuity. Cheap multimeters at Lowes etc for about $10.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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