Slight progress today, but still a fail overall. Pulled the ignition switch and it was very dirty and corroded. Looked like a likely suspect. Replaced it with new, and a new 20a fuse & tried again. Now the oil light on the dash comes on, and the fuse is holding, but the starter still will not engage. Once in a while you can hear a click down by the starter when you turn the key, but not every time. I then turned the ignition key to on, set the parking brake and lifted the seat. I pushed down the seat button and shorted the solonoid terminals. I just knew it would start! It didn't. But the starter did spin over normally, but the engine would not fire. I haven't reviewed the schematic yet. I guess time to start checking starter connections (pull the engine??)
Or pull out the test light and see how far down the harness I can get & still have power?