You were right, Dandeline68! I put a new ignition switch on the D-14, and she starts like a dream now.
I didn't care for the selection of switches at my local TSC, so I stopped by the NAPA dealer. They had one that looked almost exactly like the original. I had to Dremel the dash panel hole about 1/16th of an inch, but then it fit perfectly.
Thanks so much. It's nice to be able to count on the ole Allis again