While I should have come here first, I did a general internet search and didn't realize that the diagram was for a Coleman Mach analog Tstat. Just went out and switched the wires as you suggested and, lo and behold, I have heat! Biscuit you are a great help. Thank you so much. I never would have thought that there was that type of difference in the Tstat wiring from one brand to another. After 20 years as a Millwright and 20 more as as a contractor my mechanical skills are fairly well established. Unfortunately, my electrical skills are sadly lacking.
It seems that it is time for my medication.
RichH