Cannondaleriders

I have a mint 2003 moto, I do not ride it much, has about 20 hrs on it , I took it to a local car show last weekend and got third in my class. When I got home I rode it off the trailer and shut it down to open garage and it would not start back up. Checked battery and it is good, the only thing getting power is the tail light. Need Help!

Sounds like a treasure!

The obvious place to start is with the fuse under the left front fender. I'd be surprised if the tail light would work with a blown fuse, but you never know.

Grounds at regulator dirty or loose?