I currently own multiple ZX7’s and I’m speaking from experience on this, check the wires on the alternator where they come out of the alternator case. There’s two wires coming out and sometimes they will melt together right at the case. It’s hard to see so you have to physically pull them apart to make sure this isn’t happening. If this is you’re problem then it’s an easy fix.
"Any man who thinks he can be happy and prosperous by letting the government take care of him --- better take a closer look at the American Indian." Henry Ford