Thanks for the quick reply.
I have a 2012 Crossroads Cruiser 26RK 5th Wheel.
Yes I want to power the other things like the TV and Microwave. I am planning on a 2000 Watt Inverter. I will run an extension cord out of the inverter to the shore power plug.
Based on your response it seems as if I put a cutoff switch on the line that goes from the battery to the converter I will accomplish what I want.
I think the line is the key line would be the white line leaving the Battery. Is that correct?
My process would be to turn this switch to the off position and then plug the line from the inverter into the shore power plug. If I place the switch by the inverter, I PROBABLY won't forget to turn the switch on the line from the converter to the off position!