I am at work right now but I dont think that is OEM. I would bet it ran some accessory or was installed as a jumper to go around the short but this is at best a guess. I believe all of the wires running from that fuse box are ran inside those two looms you show in the picture. When I get home I will check and post a wiring schematic from my manual to help. I recently dealt with electrical gremlins, what a bitch, but I followed the service manual guide. I found out my rectifier was causing a bunch of my issues. Do you have a service manual? If not I can post those pages as well. Good Luck figuring out this issue.