Your Eagle Cap will be wired similar to other campers. Below is how my AF990 wiring starts.

Note, the 990 has 2 ckt breakers that will stop both the jacks and lights.
Edit: The diagram I used has a couple of errors. This was cut from a schematic I did a while back. I've since made some updates. The 40A breakers are in the main line and the wire to the generator is 2AWG.
The issue is most likely the breaker just before or just after the disconnect switch. (If your disconnect is in a similar location in the circuit)