Your 14.5 DT should be like our 15 KT. The inverter is hardwired and will supply 110 volts to the frig, all TV's and probably one outlet passenger sidewall just below dash. as long as batteries last. When not plugged in to shore power or engine running do any of your 12v lights work? If not check battery "store/use" switch which is probably in the stairwell.
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