Sounds like you have gotten way more out of the drawings than most!! Congrats on being game enough to chase it through!
But now may get into even worse as the wiring info we getis often the part that Winnebago adds to a stripped chassis they get from Ford, Chevy, ETC. and that can mean we get no more wiring info on the partthey did not build!
But that varies, so we need to look more and the answer may depend on exactly which model 07 jouney you have?
When looking at the drawings list for your RV is there a long list and then an added note at the bottom for "complete drawings" ? Have you chased that to an end to see if it gives chassis wiring that may help?
I do not often go there but some info has been there when needed, so worth a look if not tried yet. Inconsistant as to what is listed and what not???
But I might throw in something you may not have found yet??? Are you aware of the way Winnebago stamps wire ID on the wires as a way to help sort where they go and this list to "decode" the ID?
https://www.winnebago.com/Files/File...ical_guide.pdf
A second thing to throw in is that the list shows your wire MK is a power feed and that may mean it comes pretty directly off a fuse panel. If not checked the fuses for the automotive items like headlights, horn, etc.you might be able to spot the correct one for MK in that box?
But I will say you are getting pretty close to the end of the good info they give us!
See if any of that means anything and shout back if you have questions that we might figure out together as you are getting into an area I've rarely gone!