Hi again all. First, I am blown away with how helpful you all are. While I wait for the new battery to arrive, I will try to answer and update what I can. I looked for corrosion or heat stress when I checked the fuses. I was actually surprised how good everything looked. No sign of anything that would cause me to look at it further as a cause.
The voltage drop was immediate when I turned on the ignition. This surprised me, but I am learning that is a good indicator of a bad battery. I was thinking something else, a ground short or something. Usually with a short, when one jiggles the place where the short is, in this case the ignition was suspect, there is intermittent on off. I jiggled, no sign of life.
Now that I think of it, a bad battery makes sense. I assumed the battery would fade over time, I would still have headlights and panel lights, they would just be dim. Now I am learning that is not the case. Correct me if I am wrong, but when a battery goes, when put under a load (ignition on), it no longer supplies significant voltage. Much more sudden than I thought.