Check to see if the lead to the PTO coil is frayed/ occasionally rubbing on a ground/frame etc.
If you have checked everything and seem to find no apparent problems, look to see if the connections on/in the fuse holder are clean and tight,
as that can be a problem.
Also on those Electric clutches the insulation cracks/degrades and sometimes the coil can loosen and rub on the rotating disc.
To check that, you will have to partially disassemble PTO.
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