The 6 volts that drops upon load tells me that the circuit is broken somewhere. I had that recently and found an in-line fuse near the RV battery that was blown. The burned lead would conduct a small voltage as long as there was no load. Look for any kind of fusesble link, or wired in Auto type fuse in the wiring. Also, a wire that has been severed by a sharp opject, or squeezed somewhere will do the same thing. So look for abrasion or pinching along the wires leading from the circuit. Lastly, a poor ground connection could limit the current flow as well, but the whole panel should use the same ground. Somewhere, likely close, there is a break between the 13v point and the devices that don’t work. Sorry I’m not more help. I’d gladly fix it for you if you were nearby.
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