Since Freightliner no longer supports most 1994 models digitally, here are your best sources:
Unlike modern trucks that have a single convenient interior panel, the 1994 FL80 typically utilizes two main locations for fuses and breakers: 1994 freightliner fl80 fuse box diagram
In 1994, Freightliner was transitioning between wiring harness suppliers. Some FL80s have a single fuse panel under the dash; others have a primary fuse box under the hood plus a secondary relay panel. Your exact 1994 Freightliner FL80 fuse box diagram may vary based on: Since Freightliner no longer supports most 1994 models