No power to starter relay.

Did you check for ground in park or neutral at the starter relay ground terminal? Yellow is usually the trigger to the relay +12v. Brown or brown /yellow trace grounds the relay in park or neutral assuming auto trans.

Sounds like the linkage is not right or the plug on the nss fell off.
Checked the harness plug, at firewall behind the valve cover, but didn't think about crawling under and checking the plug at the NSS. I have no power to yellow at starter relay with ignition start. If I ground that brown terminal on the relay to chassis ground would that be a good test of the ground circuit from the NSS? I.e.. If I ground that terminal and it starts, my NSS circuit is the problem? Forgive my dumbness, electrical is a weakness of mine. Thanks for taking the time to respond!