After banging down the road in our class a gasser for years and plenty of research we have finally purchased a 97 Monaco Dynasty in xlnt condition. I have many things to learn about in a diesel motor ...
Since there is such a lot of variation in how the electrics are set up, I think you'd have to find a manual for your specific model -- it should be available on line, as companies produced these for some years without major changes.
In my DP, for instance, I had to actually select the inverter to be on and providing 110 power. Something I seldom needed, as we were almost always plugged in or on generator.