EyeOnAlaska-
As "RayIN" wrote, wiring diagrams for your coach are available at
this link.
I've attached a JPEG of one of the important drawing sheets below.
According to my research, your Class C coach has an exterior compartment inside of which is the shore cord and two electrical junction/outlet boxes. One box terminates the shore cord and then feeds the load center under the bed. The other box terminates the generator cord and has a receptacle on its face. When you want to run on shore power you plug the shore cord into the shore power source. When you want to run on generator power you plug the shore cord into the generator outlet.
It sounds as if you want to supply your entire coach from the Victron inverter, now and then, while keeping the existing generator and shore power manual changeover. In particular, you want to "intercept" any appropriate 120V wiring between the dinette and the load center, to avoid having to run new 120V wiring between the Victron and the load center.
On your coach, this should be simple to do.
That external compartment is under the center portion of the dinette, almost directly centered under the window on that side of the coach. The compartment is above the coach floor. It should be a short run of wire from the Victron to that compartment.
You have two options:
1) If you want the Victron to be "just another 120V power source," mount a junction box inside the exterior compartment. Wire the Victron output to a receptacle on the face of that junction box, same as the generator. When you want to run on inverter power, plug the shore cord into the Victron output receptacle. Call this the "manual" option.
2) If you want to use the Victron as a 120V transfer switch, mount a junction box inside the exterior compartment. Move the shore cord termination from its current junction box to the new box. Wire the Victron input to the shore cord inside that box. Next, wire the Victron output to the load center input in the existing (and now half-empty) shore cord junction box. Call this the "semi-automatic" option, because for generator use you still must plug the shore cord into the generator output receptacle.
Both of the above should accomplish what you want.
That said, I question whether or not you want to run your entire coach from the Victron and whatever battery bank you have. You don't mention if you have replaced the factory battery bank or enlarged its capacity. If you have not, I expect you will not be able to run the air conditioner off the Victron inverter and factory battery bank. The "old school" way of getting around this is to put all (reasonable) inverter loads on a separate 120V breaker panel and use an inverter to feed that, leaving the A/C connected only to the load center, so it can run on shore power and generator, but not on the inverter.
Finally, if you are unclear of what is needed, or unsure of your abilities around 120V electrical systems, please hire a professional to do the work. Then, check his work.
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