C class genertor

And it all depends on your RV. If you've got an older one like me, you can't be on shore power and generator at the same time. The entire RV feeds through one line. If you unplug it from the socket for the generator to plug it into shore power, then you can't be on generator power. Likewise if you unplug it from shore power to plug it back into the generator socket, you can't be on shore power.

So it's real easy with a old RV. If you aren't plugged into the generator output socket, the genset power is going nowhere - it's just runnning doing nothing.