I'm thinking this is one which will require going direct to Winnebago for info/ drawings as they only post online back to 1990,leaving us cold for info.
There is a small help which I do not know if it applies to the older RV or not?
At some point Winnebago started labeling the small wires.
You may/may not find these on your wiring??
But IF you do there is a list to "decode" where the wire comes from and goes to.
https://www.winnebago.com/Files/File...ical_guide.pdf
Reports say folks get good response when calling Winnebago direct?
Their home page for info?
https://www.winnebago.com/
Good luck on the chase but it may be a trek!