"Tinstar".....As stated, your coach was not set up to have the refer run off the inverter. In those days, they just expected the refer to kick over to propane when power wasn't present. New coaches run entirely off the inverter when going down the road. You'll be fine to remove the ice maker plug from the outlet and plug in the refer into that outlet. I would lift the bar on the ice maker so doesn't try and make ice.
Your coach will produce enough 12 volt power while driving down the road to keep your batteires charged and the inverter running.
