[2billt]

The e-pto should have a two wire (+-) pigtail or a quick connector attached. You should also be able to apply B+ & B- to confirm electromagnet switch function.
If no pigtail or fixed connector, you need to replace the clutch assembly unless you can salvage the unit by taking it apart and rectifying the wiring access.

 

[2billt]

I agree, even if the e-pto was optional, I think it should've been shown. The wiring from switch to the e-pto is simply pos & neg, activated safety switches power up the PTO switch. You can ohm the posts on the switch, in on position, to identify them easily.