Constant power for critical components like the Engine Control Module (ECM) or transmission controller may be supplied by in-line fuse holders located near the battery box or between the batteries and the engine. Fuse Identification and Diagram
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. 1994 freightliner fl80 fuse box diagram
💡 If the diagram on the lid is worn away, you can use a voltage tester or multimeter to check both sides of each fuse while the ignition is ON . If power is only on one side, that fuse is blown. 🛠️ Troubleshooting Common FL80 Issues Constant power for critical components like the Engine
| Fuse Position (Typical) | Amperage | Circuit Protected | | :--- | :--- | :--- | | | 10A | Instrument Cluster / Gauges | | F2 | 15A | Turn Signals (Left & Right) | | F3 | 20A | Horn / Cigarette Lighter | | F4 | 15A | Backup Lights | | F5 | 15A | Stop Lights / Brake Lights | | F6 | 20A | Heater Blower Motor / AC | | F7 | 10A | Parking Lights / Dash Illumination | | F8 | 20A | Headlights (Low Beam) | | F9 | 20A | Headlights (High Beam) | | F10 | 15A | Dome Light / Courtesy Light | | F11 | 10A | Radio / Stereo | | F12 | 15A | Wipers / Washer Pump | | SPARE | Various | Spare Fuses | 💡 If the diagram on the lid is