Had a chance to change out the ignition switch today. The one I removed had a loose connection to the wiring loom connector. The replacement fits better. I'll test it tomorrow.
While the instrument panel was out, I replaced the stock light diffusers with red diffusers. I didn't pay attention to how many were required when I was purchasing replacements, so I have to order another kit to completely replace the diffusers.
I also replaced the instrument voltage requlator with a solid state unit.
I replaced the K7 turn signal relay with a solid state unit.
So tomorrow I will install the battery and test these latest changes. I am hoping that the intermittent shutdowns will now be resolved since the ignition switch has been replaced.