"bullydogs1".....Check your outlets at the back of the refer. For many years (I know at least 05 and 06) there were two outlets behind the refer. One was inverted and your ice maker plugged into it and the other was straight 110 volts.
When I added the residential refer to my Diplomat, I added a second Magnum inverter. It was their small 600 watt unit with pass thru. I mounted it above the inverter that came with the coach.
All you need to do to add inverter wiring is run romex to the rear of the refer....pretty easy to do.