If the jacks will not turn on at the main panel left of the driver, I would recommend checking to see if your directionals/emergency flashers work. My directionals/emergency flashers blew a fuse and with the fuse blown, the power to the jacks would not energize.
Sounds crazy, but that's the way it is wired. I replaced the fuse to the directionals/emergency flashers and the jacks powered up again.
My coach is a 2008 Dolphin on a 2007 chassis so our coaches are probably wired the same.
2023 Cougar Trailer
Joe & Judy