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Shows three relays, one is for pto. it should take the amperage load. Is it working? Seems like it would protect the switch, that is why you use a relay! I don't see anything that identifies, the relay, all are same number. Use wire colors to identify the pto relay. Clutch should pull less than 5 amps!
ohm reading can be deceiving, best to try and test its amperage pull. Is this adjustable clutch, with three self locking nuts and springs? If so, you can close the gap between the magnet and the armature , to lower the amp load.
sorry, I'm off to bed, long day!
Voltage will not damage the switch. Has to be amperage load to heat up switch!
I see question is still open. Did the clutch gap help?