Okay, I have an electrical mess on my truck thanks to PO's hacking away at wiring. So yesterday I was starting to straighten it all out and I ran into this issue. I found this harness hooked to these relays on the firewall. Thing is, the wires are all cut and were not going anywhere. I looked at a wiring diagram but I can't figure out what this is supposed to be for. So, what are they for and where is this harness supposed to coming from? Oh, on a side note, everything on the truck works, all lights, radio, everything. Anyway, any help on this will be appreciated. Here's the pics:

http://i21.photobucket.com/albums/b254/Bear43/1971%20C10/June06003.jpg
http://i21.photobucket.com/albums/b254/Bear43/1971%20C10/June06004.jpg
http://i21.photobucket.com/albums/b254/Bear43/1971%20C10/June06005.jpg

1963 Chevy C20 Longbed Stepside
1978 Chevy K30 Custom Deluxe