[ninja250]

Might be from the accident.
If any of your wires touch the frame, you will blow a fuse.
The entire frame and anything screwed to it by a metal screw is grounded and most of the wires are "hot" or signal.. which means if they short and touch the frame a fuse will go.

It's probably like an intermittent type of thing to where the fuse only pops when the exposed wire actually touches whatever is shorting it.

It does this so you don't smoke the battery or the circuit as kkim suggests.

Since you know what fuse is popping, you know what circuit to chase down. I'd be looking for pinched wires and torn coatings etc.