Sail switch in 1976 Duo-Therm how to?
I have a older 1976 GMC class C 23' motorhome than is quite sound and runs great with 54k on it. There have been a few modifications to the propane tank (removed and using detachable 20 LB tanks) The ...
Forum Discussion
Check the size of the wiring to the furnace. Most manufacturers back then they used smaller wiring than they should have. Many times you can't get the amperage from the batteries to make the fan blow hard enough to activate the sail switch. Often it will work when plugged in, or when the engine is running, but not on battery.
