they plug in behind the dash there the fuel computer would be.

there will be three, one for mirrors, c/locking and windows. yellow, red and black iirc. they do plug into sub looms like you said and go across the dash to either door. i'm having a right pig of a job getting electric window racks and motors. there dont seem to be many mk2 orions or mk4 escort 4 door ghia's at scrappys anymore