Does the noise happen only when you try to start it (with the starter engaged) or when it's running (or both)? Does the clicking increase with engine speed? If yes, check for a loose cam chain. If it only happens while trying to start it, check the starter solenoid. Is the battery fully charged?
I don't know how the fuse box could cause the sound, so I'd guess that the noise is coming from something else.
A video of this noise would be helpful.
BTW: If you don't have an owner's manual for your bike, here's a copy.