Hi There! Just got a 75' Brave and have a couple of questions about the furnace. I know the propane needs to be on, but do the cabin batteries need to be hooked up (or shore power connected) in order to run the furnace? I see the button to prime it and the portal to light the pilot, I'm just unsure if cabin power needs to be connected. Also, is there a specific or preferred way/pattern to prime the furnace before lighting?