This past weekend we travelled to Chippokes Plantation State Park in Surry, VA. Because nighttime temps were expected to be in the 30's, I took along the ceramic heater to augment the RV propane heater (god thing). The camper is a K-Z 2505QSS. The furnace is a Suburban.
I flipped the Tstat on the furnace and no fan start. Checked all fuses, OK. The ceramic heater worked well enough, but was not too happy to have the furnace go out on a cold night.
Anyway, got home and checked the Tstat, 12V in but 0V out. Went to local RV store and bought a new Tstat ($24). Installed, and furnace fired up.