Blown fuse

After almost a year of riding and about 1000 miles I had my first issue with my Extreme 508. When accelerating from a stop, the 30 amp fuse blew leaving me pusing the bike. Afer locating and replacing the fuse the new fuse immediately blew (the key wan't even in the ignition). I removed the battery, replaced the fuse "box" since it had melted and looked for any obvious shorts in the wiring that would have caused the fuse to blow, no luck. Then I put in a new fuse and plugged the battery in just to have the fuse blow again. Any thoughts?