Jim, I have a 3 way frig, I think my problem was that I didn't leave on long enough. Will try the overnight thing this weekend, thanks for your response...
There is a thread where a few of us were trying to work on fridges...
I think there are at few quick things to know, about our amonia based fridge operation, camper models, not home models, they use a pump and freon...
Our Camper 3 way or 2 way types, use an amonia based mixture in the coils behind the fridge, and instead of a pump. To cool the insides the amonia is heated to pretty hot, pressure pushes that mixture and it gets to expand at the cold spots in the fridge. So, there is a heating "pot" at the bottom right rear (if you are standing behind the fridge) of the fridge. And this is where the 2 or 3 way comes in, in 3 way there are 3 ways to heat the pot, 110 a/c which actually probably converts ac to DC which then runs the heating element , dc (battery) directly to that same element, then lastly Propane flames.
The fridges take several hours (in warm regions especially) to cool the area inside the fridge.
Several people bought a d-cell battery powered fridge fan to help circulate the air hopes of cooling better, I had one, cant find the dang thing now after 1st year.
Best results are to freeze any of the food you put into the fridge, and pack it full, and it will get colder quicker. I even buy dry ice and since I dont use the crispers in the bottom of my 2 door fridge, this gets me a big jumpstart on the cooling of the fridge. I would also strongly suggest, hopefully chill any drinks before puttin in there. We use ICE CHESTS for drinks, due to how often you are opening the fridge for a family of pop/adult beverage drinkers, lol.
Running the fridge on DC (battery) uses the battery up quickly, if you have it on for more than an hour, most have reported dead battery, if you are not on shore power, or the tow vehicle isnt charging your camper Battery.
The 6 way plugs on Tow Vehicles do/can supply DC to help keep the battery in camper up, But dead battery or sometimes running fridge, usually blows fuses in Tow Vehicle side.
We've also shared/learned to switch fridge to propane if you stop for very long, on your road trips; IE more than gas fillup or say 45 minutes to an hour...
Some still run propane while towing, but be
warned and MINDFULL, technically that is an open flame if/when you goto gas pumps.