Suburban NT 34 Propane furnace

Recently bought a Avion 34' with above furnace in it. Furnace does nothing, so far. Spent most of day chasing wires ( 12V ) to find there is 12v to the furnace plug on the side of cabinet. The blower does not even come on. According to several Suburban wiring diagrams there is a OFF / ON switch within the furnace cabinet. I would assume it as accessible from the outside and furnace does not have to be removed to operate the switch. H e l p Is there such a switch and where is it ? In advance, many thanx for the support.