I got to thinking ; and at this time of night that's a dangerous thing
that maybe a better angle shot of the wiring harness would help.
This picture , the white arrow and the harness with the white tape is the end of the chassis harness as it comes off the frame rail .
The connector with the red arrow , is the start of what Freightliner considers the dash harness, the smaller sections of the dash harness with the blue tape go to the fuse/relay boxes, and numerous other sections wiring go through the firewall behind the dash.