Winnebago has a lot of manuals online, but they are a bit hard to find. Try this link... you will find electrical, plumbing and other diagrams and info.
https://www.winnebago.com/owners/own...s-and-diagrams
Now as far as the rest, you need to collect the various items' makes/models etc and go to the specific vendor site for those manuals. For example, your Winnebago electrical diagram will show how the radio is wired, but you'll have to go to that radio's manufacturer site to get the owners manual.