the wiring diagrams is in this link (among others). I found their library is quite useful.
https://pandpsmallengines.com/pages/...arden-tractors
looks like the seat switch for PTO is NO and the one for the ignition is NC
the reverse switch/relay is in there as well as the brake switch.
If I remember right the sequence is the PTO will stay on if the brake is engaged and you get off the seat. but without the brake engaged if you get off the seat the PTO cuts out and needs to be turned back on. if you reverse the PTO might cut out as well but does not need to be reset - but I may be confusing that with JD's sequence.