Sorry in advance. First real post on the site. Just got a 2003 coleman Tacoma. Had it opened a few times to clean etc and tried to test the fridge. Plugged the pup into the house power and flipped the 120 switch and after 2 hours nothing happened. No warming of the pipes behind the fridge at all. Tried turning it to the 12 volt and after 15 minutes the pipes warmed. So I have a few questions. Is it possible that the 120 switch is bad? Or any other explanation why 12v worked but not 120? If the pup is plugged into a hookup and I run the fridge through the 12v switch, that will run the hook up power through the inverter and shouldn't affect the battery right? And if so, can I plug the pup into the house and run the power through the inverter safely with the pup closed? Trying to let the fridge cool before use. Thanks in advance. First driveway camp out this weekend!!!