Tacking on another twist for this: on a recent trip, I went into the camper for something while we were enjoying a late evening campfire. I heard an unusual sound and after listening a bit noticed the fridge was running on high. I checked closer and saw that the internal temp readout showed 44 degrees! Getting a bit anxious, I opened the fridge to check the thermometer we keep inside- it read 32 degrees. Now I figured we had a malfunctioning fridge. Wondering how long this might have been going on, I checked the camper battery voltage. It had dropped to 12.2 volts. I unplugged the fridge and figured we would be alright until morning since the air temp had already dropped to 45 degrees and was heading south. Driving the next day would recharge the battery and we could get some ice to keep the food cold.
I returned to the fire and mentioned the problem to my wife. We had a brief conversation about the pain it would be to try to get the fridge fixed and then dropped the subject. After a bit of fire gazing, my wife mentioned she had put dinner leftovers in the fridge and they were still hot. Maybe that had something to do with it. Lightbulb! I went back and checked the fridge contents. The container with dinner was sitting on the bottom of the fridge and was still warm. I figure it was sitting right on top of the temp sensor and was causing the fridge to keep running even though the actual temp in the fridge was quite cold. So in spite of evidence to the contrary, the fridge was working fine. If I hadn't noticed it though, it would have drained our battery trying to cool that hot food. Lesson learned.
The isolater is going back in. I just bought the wire connectors to hook everything back up. I guess I should buy a hearing aid.
--what happened, did the world end, lights flashing, buzzzzzzz, what the hell, didn't smell gas or nothing, crashing around trying to find the flashlight, afraid to touch anything, dog howling, then something made me remember that this can happen (????) when the battery is low, and since I was not being gassed or nothing, a second possibility --the battery was low-a quick run outside in my shorts, started the truck and the noise stopped! Ahhhh, went back to bed, ran thru it again, but learned the lesson--MAKE SURE YOUR BATTERY IS ON AT LEAST YELLOW WHEN YOU RACK OUT AT NIGHT!! Yep no fool here, several more midnight awakes and I learned , my window is always open, I usually don't run the therm/heater all night ( what did someone say awhile back, cold nose, warm toes )sometimes it goes off today, but except for that first "what the hell" the world doesn't end and it part of the FWC experience. Enjoy 
and learn how to do it right. I guess now they have the same problem with new cars and the beeping alarm that my neighbor down the street seems to like setting it off 
.
