changing wire harness on chasis volvo vnl

[ktbtrucking]

the harness splits at the end of the cab or rather after the cab , i am missing some section here and looking to the front i see large harness goes on driver side .is there another plug/connection before it hits front of cab?
second question if fix fuel lines and air lanes parking/service lines without abs lines and will not do any work on electric will it be drivable with no abs and tail lights ,and no trailer lights/ just left with the tractor another party took the trailer already