Alternator started sparking

It is... It’s an LA 360. Just did a visual check of the harness and it looks fine, but that is not saying much. I’m a pretty incompetent when it comes to wiring, but slowly learning. How would I test if the wiring shorted out? Thank you!

I do have a manual 67Dart273. I’m going to strip it down and see what’s up with it. I’ve never opened one up, so I’m kind of looking forward to it. Thank you!