Note the make and model # of each system in your RV, from converter/charger to furnace, water heater, A/C, etc. A Google search of the make and model number followed by the word "manual" will yield lots of files to download and read. As to wiring diagrams, while everything is working, pull one fuse or flip one circuit breaker at a time and see what stops working. Lots easier now than in the middle of the night or a rain storm! Take voltage readings of your batteries at rest and on charge to also get info that might help later. Even if someone can give you a wiring diagram, they leave out a lot of information, like WHERE the wires run, are joined, etc.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI