There is this stuff called Liquid Electrical Tape that I really like for these types of jobs. They sell it at all big box home improvement stores. I recommend buying a cheap set of various size art brushes as well to apply it with precision b/c the can brush is huge.EDIT: Yep, it was exactly what I thought. The power wire inside the housing is making contact with the grounding point, but I was able to remove a bit of slack from the inside of the housing to reduce chance of contact. I still don't like how close this all is, so is there any way I can insulate it?