I fixed it. The problem deteriorated to the point that the car would never start or have power to the dash. Only the relays would buzz (door open relay).
I decided to clean the battery terminals and cable clamps with a brush. That fixed it immediatley.
Lesson learned: Clean the battery terminals/cables clamps first even if they don't look corroded for odd electrical problems (especially buzzing ignition-off relays). It is simple to do as a first step.
If I had had a solid constant no power condition, I would have removed the battery cables earlier to check/test battery and discovered this fix earlier, but the marginal battrey connection fooled me. Ignition-off relays like door-open buzzed because they were apparently not getting enough voltage/current due to poor battery connection. Of course dash and ignition didn't have enough juice to power on either. Transmission lever temporary fix above must have somehow changed load on battery enough to get juice flowing - further distracting me from the real fix.
Thought you would like the confirmed happy ending (seems like few posters ever come back to confirm the fix).
Monday, September 21st, 2020 AT 7:13 PM
(Merged)