@Islandsmith my 34J is a 2015, my inverter is also in the second (including the small/long cargo bin) rear most cargo bin on the slide side.
Thanks again everyone, especially @javelin for the generic schematic. Turns out the loose wire was the issue, I attached it to a positive terminal and we're back in business!
The House has basic power (lights/nav) when entering and everything is working as expected. Here's what I think happened: the original house batteries were failing (low voltage) which caused the original issues with the converter not providing sufficient power to the lights/house as expected, then when I had the mechanic swap the bad batteries for good ones, they overlooked connecting the connection for the the converter as shown in the schematic, which made it seem like the same issue persisted, but really it was a different issue with the same symptoms.
Connecting that 'lose' cable to the positive terminal seems to fix the issues i was experiencing.
Thanks again to everyone that responded! I'm really looking forward to being part of this community!
-T
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