On my diagram, I offer three things for clarity.
(A) The Seat Switch is Normally Open (NO). It closes when someone sets in the seat. The PTO will not run if no one is sitting in the seat.
(B) The Reverse Switch is Normally Closed (NC) when the shift lever is in the Forward Position. When the lever is moved into the reverse position, the circuit is opened. Thus, the PTO will not run when the tractor is in the reverse mode of operation
(C) The "E" terminal on the PTO switch is a "start circuit" and is only a Momentary Contact (MC) part of the switch. It is spring loaded. See Attachment....
The above items are designed into the circuit to meet Federal Safety Standards.
I am sorry for the confusion
I assumed that was understood.