Components like headlights and high beams often use relays rather than just fuses. If your high beams are out, the issue might be a faulty module behind the passenger side panel.
The engine compartment fuse box contains the following fuses: 1994 freightliner fl80 fuse box diagram
If you cannot find a specific panel, check under the dash, under the driver seat, and inside any body compartments. Components like headlights and high beams often use
A label identifying each fuse and relay is typically found on the inside of the access panel cover . Secondary & Inline Fuse Locations check under the dash