Richard,
I'm attaching a .jpg from a 2003 Monterey that may be hard to read clearly. It suggests you have two GFCIs and everything else is downstream from one or the other.
The diagram suggests that there is a 4 breaker panel near the inverter. In mine, there is a 4 breaker panel from the inverter but it has been relocated to the bedroom next to the primary panel. On that panel, one breaker feeds two GFCIs that distribute all the electricity to the accessory circuits.
If it were me, I would pull the cover off the breaker panel and see if it is "hot" with a volt meter. If not, it is a problem with the inverter. If it is hot, it will be a problem with the GFCI, in which case I would pull the cover and check that.
Note that there are "junction boxes" in the circuit. Each will have wire connected with wire nuts. They can come loose. On mine, one did that lead to the A/C units.
Good luck. I hope the diagram helps. It is not as sharp as it could be. I'll be "home" where I can scan a sharper version in a couple days and can send it too you. Let me know.
Hope this helps.