No spark on Toro 8-32 Professional riding mower. Wiring diagram?

Hi,

My Toro 8-32 "Professional" doesn't want to ...send the electrical pulse over to the spark plug so that the engine will run. It's a Model # 56150 and serial number 9000001 - 9999999.

At first, I thought it was simply the ignition coil (or magneto) so I got a new one. Still no signal being sent to spark plug. I have followed the instructions of having the mower deck disengaged, the key turned "on" and the parking brake "on", pull the recoil starter and ...no spark.

Then found the switch that is engaged when the mower deck is disengaged is broken, I jumped it --- so that shouldn't be the issue.

Then found the switch on the transmission that ...must be telling the machine when it's in Neutral, and did a continuity test both in neutral and not and each time the switch was open. So I jumped (closed) that one.

Still no spark.

Looking at wiring harness. Disconnected harness at back of starter/key switch and it's a rusty mess. Going to buy new one now. Going to clean all connector-ends of wiring harness and put on the new starter/key switch.  [Got new starter/key switch, cleaned all wiring connectors -- plugged back together; annnnnnd:  no spark].

What's interesting is that the starter/key switch, with me sitting in the seat, engages the Starter. Still no spark.

Thinking that Something in the wiring assembly is open or closed and telling the ignition coil NOT to send ...current to spark plug. Can anyone help? Even a wiring diagram?

Thank you.

Jay