I also have been scouring the internet and have yet to find a wiring diagram for any carriage product. There are "service manuals" available, but each I have purchased-found is just a collection of every refrig, stove, oven, pump, AC, inverter, charger, service manual sold in a series of years. No diagrams of the actual coach, and I have tried.. searching through a 5Kpage pdf is tedious
The best part is, in my opinion, they are really well built and worth the effort to rebuild and repair. Built like tanks, takes a healthy tow vehicle. I am on my second rebuild and it is nice to work on something that will still be on the road in another 20 years.
Also currently there is still a group of users helping each other out on the https://www.carriage-lifestyle-owners-club.com/
Site is slow so you have to be patient. I usually write and load my questions here first, (IRV2) and then copy and paste into the carriage lifestyle site. But WORTH the effort. Great place to get real feedback, and some knowledgeable people on the Carriage line. I also paste any solutions I discover here also, for fear my work may disappear if only on one site.
The units are pretty simple and once I took off the basement wall pieces, laid on my back and spent the time to note everything, it got easier, there are really only a couple of wiring looms to follow.
Hope this helps, What are you trying to fix currently?