Two or three big clues to sort things.
One is the label that you may find on the wires.
This will then be "decoded"on this list:
https://www.winnebago.com/Files/File...ical_guide.pdf
This can give you the from and to of that wire!
Looking at the drawing you give, see the wire ID next to the plugs and also at the speakers? LA, LC ,etc? That can give you a start on what the wire does and where it might go.
Then if you need to chase it back further on the drawings, the info of where that plugs "mate" is located on the drawings is in the small print to the left of
the plug on this drawing.
Using the same set of drawings where you found these, it shows to find a mating plug on sheet 4 and where E and 8 would cross like reading a paper map?
This finding the exact spot on the other pages can get tricky because there are often several sheets in a set and we have to mentally think of them as laid side by side. So if you want something like sheet 6, there are often several pages showing sheet six in the lower right corner! To find the correct one, like if you want E and 16, your page may only go as high as 8, so you need to find the next page with 9 and up across the top!
These speaker wires seem to have far more connections/mating plugs than most things, so it looks like there are speakers in several locations with these same four wires running to at least four places on the drawings and likely in the RV?
Don't let it tripyou if the wire ID is somewhat "off" in the description as they are kind of loose on what they call things at times.
The drawings also give you the wire gauge and color to help when the labels are messed up and you can't read them!
When you need to know where the wire may be located on/in the RV, going to the " installation" drawings can help. They are hard to follow the lines at times but may tell things like it runs downthe windsheild column or something that helps.
See if that helps and shout back if needed?