Hi folks, I have a 2003 Sundance 530S. The original fridge, an Electrolux, just packed up and I have replaced it with a Thetford. The problem is that the Electrolux had mechanical switchery and the Thetford has electronic. The 12v supply for the electronics is the one that turns off when the engine starts so although it has the heavy duty 12v to keep it cool, it cannot be turned on while driving. Thetford, anticipating this problem, has provided a bed for 6 u2 batteries to run the switchery so I can in fact get 12v cooling while driving. Unfortunately the 6 U2 batteries only last a few days which is a real pain. Has anyone found a way to get permanent 12v to the fridge compartment? .