Okay, lots of info that may help. I can ignore most anything but If I can't find it, I have a hard time deciding what to ignore!
So a good place to start on finding/knowing about parts is this interactive parts setup:
choose the RV, choose the section like electrical, etc. and then you can zoom, scroll or drag to turn the view to get down to the exact area or part!
On the right is a list of Winnebago part numbers! Once you have that number, I go shopping online for price!
Search by part number can often turn up several different places to go for parts. Winn and Lichten(?) in Iowa are go to places but you may find it other places at better price/shipping combo, so I do some looking. If you find it on something like E-bay, you may get lucky and pay half price? Part of the game and depends on the normal trek!
Big hint may be to go to the lower left, click on a plus sign and then click on a part that you may want to keep centered? Doing that should pop that part to center and keep it there as you turn/rotate the RV around that specific point. Sounds silly but helps a great deal if you can keep from losing the part! However, it needs to be done BEFORE zooming too much.
so maybe you spot the name of the part on the list but have no idea WHERE? Clicking repeatedly on the name makes it flash in yellow on the drawing and that yellow flash can make it easier to spot?
Takes some play to get it down but it can be a big help!
On battery drains, you likely have hidden drains which can trick us. Some are safety items like CO and propane detectors and they DO NOT want those turned off, even if you use the battery disconnect switch! No coming back to an RV full of gas, so they leave the detector on!
The way this gets us in trouble is when we turn the disconnect on and think there is no way the battery will drain while we store it. WRONG and truly one that catches most newer users!
Don't want to blow the brain all in one trip, but this is a quick rundown on a vital area for your batteries:
You are in an Rv that was about when they made a big change from a mechanical relay to connect coach and chassis batteries at different times. That means I don't know if you have less complex mechanical or the later solid state. Battery Isolation Manager (BIM) or solenoid? But solenoid is easier to draw out and spot how they both work on this drawing. When you get down to it, you can peek to see which you have?
But for the idea of safety wiring, this is the plan that shows the safety items do not go through the disconnect relay!
View attachment 2414506
Black wire comes from disconnect switch to control the relay at right side. When relay is closed power from coach (RED?) comes in on left goes through relay to go out to RV to power various items. Wire GJ is power to safety item and doesn't go through relay, open or closed! Stays hot full time to try to drain battery!
Then as different issue, this shows the way the two battery groups connect./disconnect at different times. Not part of the drain question but an important thing to know when/if we have trouble.
Red (coach) meets green (chassis ) battery at tow different times. Whether you have the solenoid, often a silver metal can, or BIM which is a black plastic covered item that looks more like a small motor, maybe? Both do pretty much the same with much the same wiring but one is harder to follow on drawings!
Purple marked wire LR brings power from the front at tow times. That power goes through the coil in the solenoid to ground at the mounting screw! If that mounting screw gets loose, etc. this relay may stop working!
Lr getting power when we have the engine on, makes the solenoid close and connect coach to chassis battery as we drive. That lets us put some charge back into coach batteries we may have run down while camped without hookups!
OR
A second use is if we find the chassis /start battery is dead, we can push a button on the dash to get a "jump start" without getting out cables! That button also puts 12VDC on wire LR to close the contacts! BIM also does much the same, but I have to admit that I like to hear and see things work. Solid state works and last better but I can't see or hear it work!

Nuff said! Way too much for one day!
RV info is like steak? Really good if we take time to chew it. Really BAD if we try to choke down too much at one time!
Do it as it fits you!