I have just edited a wiring diagram for the 2008+ Ninja 250r. I have made this diagram easy to follow and added some detail.
This is version: US 1.1 (my version of the diagram)
If you have ANY requests or suggestions, please leave a comment here and I will look into them and possibly update the diagram.
I might soon change wire colors from black to colored for easy reference.
Here is a link to the complete wiring diagram.
Click here for the full size wiring diagram. (1600 x 1200)
Here is a diagram I edited for easy reading and tracing on the turn signal circuit.
Click here for the full size wiring diagram with turn signal circuit highlighted.. (1600 x 1200)
EDIT: Replacement pic:
.