Many of the harnesses have extra stuff on them. I still have a bunch of unused connectors on mine. A couple are from disconnected/removed emissions related stuff. But some are carry overs from things that were used before or maybe for planned stuff or optional. I was looking at wiring under seat last week. Lots of extras there from 74 ignition interlock I believe. 8 pin connector with 6 wires to the seat and only 2 wired back to the dash harness for the driver side belt.