What are you trying to sort out? They all conform to fairly strict standards so there may be some similarity between them.
I've not got a full diagram of mine... just an abbreviated one which labels connections, fuses, and components.
The options and functions are specified as per the old KKK 1822 Standard, but how they get there varies considerably among manufacturers. BTW,
GVS (Ground Vehicle Standard) for Ambulances v.1.0 is the new standard, and it went into effect on July 1, 2016.
Since my build is as a trailer, I pulled all of the wiring that went to the cab back into the module before I cut the cab off. I kept as much of it intact as possible, but you can only get so much through a 3" hole in the floorboard.
This is what I'm trying to sort out...
Even thought the wires are labeled for the most part, once they disappear into a bundle the size of your wrist and go behind the overhead or a wall, visual tracing is almost impossible. A diagram would help considerably when it comes to seeing the 'big picture'!