I'm no wiring expert but...

Lately i've noticed my harness between the fans, the wires are getting hotter than hell. Hot enough to cause the plug connector to start melting, on the side with the black wire. What would cause this to happen all of a sudden? I donno what to check or how to check this but I know I need to figure this out. I;'ve never had a wiring problem with the car until now.

And no, the wires aren't getting hot from the engine bay or the headers, its in the wiring itself.

Anyone have any input?