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When you see 12 VDC on either side of that probably 50 amp cct breaker in your picture, do you have shore power connected or the generator running? If yes, then you are probably seeing the converter output 12 VDC and not the coach battery 12VDC. If that is true then my guess is you have a bad or just open latching relay between your 12V coach battery and the cct breaker shown in your pictures (red wire connected). Then you need to find where the latching relay is located......try following the red wire you say seems to come from the coach battery. Trace it out if you can or start at the battery end.
I am attaching a generic schematic which may help anyone visualize a generic coach (with hydraulic jacks; generator and on the right side of the diagram is the typical 50 amp cct breaker (shown in your picture) and a latching relay which is typically controlled by the door use/store switch or similar. This is a generic diagram only. Hope this helps.
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