Possible electrical issue, help sorting?
 

The boat is a zx24 Skeeter bay fishing boat with a 4 stroke 250 yamaha. 2005 boat and motor.

Recently it was popping the main switch fuse, just out of the blue. Hadn't changed anything just started doing it and it would happen somewhere when the boat was turned off and turned on. I replaced it a few times, well it went away... odd. It was this past week so I wasn't complaining and meant I can still get the boat out on the water. Well I go out on it and she works great, take it home to the dock like normal and go out the next day to take it out of the water and I have no ignition power on my tachs and motor, which is different than before when it was blowing the fuse as it wouldn't let me trim or do anything with the motor. I checked all the fuses etc, nothing. Just weird as it worked when I turned it off.

Thanks.