I’ve been having the same problem as you on my 2014 MZ magnum with a 651v kawasaki. I got stuck in a low spot, shut her off and was not able to start up after I got it back to flat ground. I checked continuity on the fuses and safety switches, battery is new, and replaced the solenoid. I can only get a click out of it and my next step is testing the relays.IT"S FIXED!!!!! The problem was the in-line fuse holder that connects to the solenoid. It was not making a good connection thru the holder. I replaced it and she starts and runs.
Thanks for the help. Glad to have that done and can move on to something else.