Electric issues

[gmodeste816]

Friend layed bike down on mud. My air cooling system (or at least that's what I believe it is) got scrapped pretty good. I have an engine fairing I'm in the process of restoring so I'm not too worried about that. But my right turn signal also got knocked and the night after my turn signals, tach, horn, neutral light, and brake light aren't working. What's the best way to go about trouble shooting/ getting all new electrical.