I recently was looking for wiring diagrams for my 2001 Signature. I sent a note to Monaco technical assistance through the website and received what files they had. They sent me 37 wiring diagrams files. Sent the request and received them the same day. He is a link to the website. https://www.monacocoach.com/technical-assistance.
Their note that accompany it was "Hello! Your coach was built by the previous Monaco Coach Corporation, which closed under bankruptcy in 2009. Unfortunately we sometimes have limited information regarding its construction. Attached is what we have on file, hopefully this will help. (Note that not all of the attached may apply to your specific coach, depending upon which options it is equipped with)."
This is still better than nothing.