Work horse WH w22 chassis electrical

Need wiring diagrams..schematics, chassis build Dec 2009
RV Thor Serrano Jan 2010

Not Fleetwood

Matt
This belongs to a relative and AFAIK, I'm the only one to have touched the electrical since he bought this thing in March 2010
My first thoughts were over load condition from something aging and wearing, which is what I tried to test for
The fact that several items have totally quite working is leading me to believe a wiring problem,
Hence the need for the diagrams to help in tracking down the problem
I really do not want to start cutting open all the wiring harness trying to find the common ground,
It's not a common hot problem, fuse block has power,
Problem must be on the ground side of the circuit