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That breaker has nothing to do with the 12 VDC side, UNLESS it has the converter on that branch. More than likely, it is either the water heater element that is shorted out (unless it has a separate circuit and breaker) or the fridge heating element is burned out and shorted out. OR it can be a short in a radio or stereo.........something like that. What DOESN'T work when you turn that breaker off? And that is a 120 VAC breaker so it only trips out on shore power. Get back to me about what may be on this breaker that doesn't work with it off and we can go from there. All follow ups are included in our fee. R.J.
That could do it for sure..........those outlets are pretty cheaply made and I replace them with conventional ones from the hardware store. Less problems. Get back to me, Jay if you need more later. Thanks!