Hi folks, if you've tried searching for the official Fender Wiring Diagrams for the KC Mustang and Jag-Stang, you've probably come up short.
I contacted Fender recently, asked for the diagrams on their end and they delivered! The Jag-Stang one looks hand drawn, but it's indeed the official Fender one!
Sadly, these are sparse on Part Numbers for the whole guitars compared to other diagrams, but I digress. Here are the goods: http://imgur.com/a/7gpz3