Great info! Now I think I know what may be the problem. First off, the cooling unit is new and as far as I can tell it doubles for 12v and 110. It is a Dometic.
Second, when it did work on 12v, I was able to notice the drop in available power on the monitoring display (above the stove on my Sunrader). Currently there is no change in the display when I turn the refrigerator to 12v so I am certain it is not getting power.
Third, I had a car stereo shop recently switch the power source for my dash stereo from my ignition battery to my coach battery. Since the refrigerator power comes directly from the coach battery, something may have been dissconected in the process. The two events do coincide timewise.
Thanks jdemaris for the info. That's why I love it here. 1 reply and I should be squared away!