Great write up Ray. I would have seen you up there but changed at the last second to take a Nor-Cal coast trip...maybe I made a mistake but I was in the Yellowstone area in July so the decision was somewhere new to me. I had the same problem with my diesel heater in Wyoming not fireing but found the problem was the high altitude switch. Tell us what you find on your furnace. Fantastic pictures!
2006 Ford 6.0PSD EB-50/E-PH SMB 4X4 Rock Crawler Trailer