A slight click could mean the solenoid is sticking but I would think the battery is the culprit given that it is two years old and just out of nowhere sudden death. If it is a conventional lead/acid battery of generic brand, then two years is about the average life expectancy of them. Sounds like there is possibly a plate or two inside it that has arced together killing the power. I was going to suggest one other possible situation which may still apply, if you have never had your e-box opened before you may just want to unscrew the fuse plug and see if the fuse is getting wet and/or corroding. It's the strangest thing how fuses can be conductive but still fail. It seems to be an abundantly common problem with the Kawi ZXi 900 runabout skis. The fuse blocks usually look really good and conduct most times but when they start to act up it will drive you nuts trying to find the problem. I end up usually taking the fuse block out of them, buff the connection points with a Scotchbrite pad and a little coating of dielectric grease, problem solved. Seen it happen with the little round inline fuse connectors too. They just need to varnish a little bit to act up.
