I have a 2006 TM T-36. The question regarding the mystery switch has been asnwered. The frig only works on power - it will work from the invertor and the batteries are charged by the engine while running. We typically turn on the invertor (within the panel where the hot water switch is located) while driving. This keeps the frig running for us. But, don't forget to turn it off if parked for a long period of time and you are not turning off the battery switches (located by the door on my unit).
welcome!!
Michael
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'06 Tourmaster
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