Phil,
The diagram in my post of 3-16 above is the only one I have... You can see it is quite generic and does not even show the shore cable power reel to wind up the 50 amp cord -- so that set of slip ring contacts is not seen on this drawing.
The engine heater breaker is the one that controls the 110 outlet (upper right rear of bay, as I recall) in the bay with the cord reel. The engine heater is a corded unit that is plugged into this outlet. If nothing is plugged in there, look for a loose cord with plug in the adjacent area...maybe a prior owner unplugged it. I thought the heater was thermostatically controlled to only operate at temps below about 35 degrees or so -- much like frozen pipe heater tape. You can use an AC amp meter to see if anything is drawing power on that circuit. I would expect any useful engine heater to draw multiple amps, perhaps as much as 8 or 10.
I used this outlet to power the battery maintainer/charger for my engine batteries when on shore power, so that breaker was always on at my coach. Since I was in coastal Oregon, I never used the engine block heater, and that cord was left unplugged...
Chuck
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