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There is no one standard wiring diagram for any RV. There are too many options and floor plans for there to be a "one fits all" wiring diagram. In my years working around these vehicles I have found that no two are the same. I think the wiring depends on the installer, time of day, and his or her frame of mind. But what specifically are you looking to find in your motorhome?
I am currently working on the heater and A/C fan control and blower wiring and have gotten most of it figured out and operational. There is one wire going from a 30 Amp circuit breaker mounted on the control which leads to a relay that I am starting to troubleshoot to determine what it does or where it goes. I was primarily interested in a wiring diagram associated with the dashboard area where the Dodge Motorhome Chassis wiring diagram leaves off. I was also interested in finding an overall electrical schematic showing the interconnection of other components, generator, converter, fridge etc. for help later. I realize wires could have been run anywhere as you stated, but would have thought their would be a standard on what to connect versus how to. Thanks for the reply.