I'm hoping to wire my attic fan to a junction box in the attic. This is what I found in the junction box. I was hoping somebody could tell me what might be going on here, or how to proceed with wiring the attic fan directly to it. I also don't know where these wires lead. I assume the big black wire is the load coming in. But I don't know why the white (neutral?) would be cut on the one cable. I recently bought the house, so I'm finding all sorts of fun surprises. House is nearly 100 years old.