Welcome, I just bought an 89 Chieftain last friday, and am exploring it
I believe the Sunflyer, and Chieftain are very similar.
To make your generator run the house electric, you need to plug the cord into the matching plug in the compartment with the power cord,
That acts in place of a switch. Super safe and simple way to do it
if it is not running things there is a switch on the generator that turns on the juice from the generator.
Took me a few minutes to figure out, and find that secret switch.
Power converter is behind the passenger seat, in the floor.
Be glad to trade pictures and info with you, if you get hung up.
I am tracing some homeless vacuum tubing and have no clue where they go
89 Winnebago Chieftain M23RC
A work in progress