Your wiring for factory are here:
https://www.winnebago.com/Files/File...ram/Wiring.htm
You may get the best info in picture form here:
https://www.winnebago.com/Files/File...994/111486.pdf
Note there are two drawings, depending on Chevy or Ford, labeled at lower right corner?
Small wires labeled like this?
Use this to "decode" the labels?
https://www.winnebago.com/Files/File...ical_guide.pdf
Battery cables were marked like this when new? Possible tape at tends are still there on some?
The charging question is almost a book of it's own!
Winn has used the same basic parts "forever"!
RV have three sections of wiring and they connect together at times and disconnect at other times. So it gets "wordie", so hang on!
Chassis wiring is the same as most truck wiring. Engine alternator charges the chassis battery for truck things. For instance, headlights, wipers, etc, look to truck drawings as Winnebago just buys stripped chassis and adds their parts.
To get deep into chassis items, we have to go to chassis builder info like Ford, etc.
Coach wiring 12VDC is for all the RV things, inside lights, fans, awning, etc.
Then they also built the 110AC stuff for Air cond. microwave and outlets.
When working on one, think first of which group to search info.
But then things get funky as the chassis and coach are tied together at times and separated at other times!
Click this snip or go direct for big picture.
This little area is critical for the RV getting things charged at the right time!
The blue wiring is the control wiring that operates a "mode solenoid". There is a dash switch that may be labeled different with each RV. Aux, boost, or others at different times??? This dash switch operates the solenoid as we push it (momentary switch!) OR the same wire (LR?) is also hot when the ignition is on! Power on LR from the front goes to solenoid coil and closes the contacts inside to connect my red to my green! Power goes through the coil and gets to ground by using the mounting screw on your year model!
Gotta keep the mounting screws good, clean and tight!
When operated this solenoid connects chassis battery with alternator to the coach and they charge at the same time as we drive!
The second function of this solenoid is when we find the chassis battery might be weak, we can push and hold the dash switch to get a "jump start" from the coach batteries!
Disconnected when we stop but connected when we drive!
This solenoid tends to get lots of use every time we start and it is a common problem as the contacts get burned/corroded over time and the coach batteries stop charging as we drive! Take a note on that for future?
Basic idea is the RV converter will charge the coach batteries when stopped, engine off and we are plugged into power
Chassis battery is charged from engine alternator. It also connects and charges coach as we drive!
So each has their own charging unless somebody has added wiring and gizmos to get power form coach to chassis! Trik-L-Start was one item some added to power from coach to chassis but those folks were out of business last time I heard!
Way bigt subject but that will get you started, maybe?