Some models house a secondary fuse or relay panel behind a removable panel on the passenger side of the dash. Under the "Dog House":
: For trucks with automatic transmissions, separate fuses and relays for the push-button controller may be located in a dedicated box under the dash or within the engine bay. Fuse Layout and Troubleshooting 1994 freightliner fl80 fuse box diagram
: Tail lights and turn signals are frequently on separate circuits; if one side is out, check for a dedicated left/right fuse. Some models house a secondary fuse or relay