Because Freightliner Custom Chassis were often customized by different body manufacturers (such as_utility bodies, dump beds, or box trucks), specific fuse layouts can vary slightly. However, the 1994 FL80 typically utilizes the standard Freightliner "Module 2" or "Module 3" fuse panel configuration found in the FL series of that era.
Since Freightliner did not have a single “universal” diagram for 1994, the following is a representative diagram based on the most common factory configuration. Use it as a starting point. Always verify with your truck’s specific build sheet or visual inspection of the fuse panel. 1994 freightliner fl80 fuse box diagram
Layout – left dash fuse block (viewed with door open, cover off): Because Freightliner Custom Chassis were often customized by
+-------------------------------------------------+
| [1] 30A | [2] 15A | [3] 10A | [4] 20A |
| IGN | TURN | CLUSTER | WIPER |
|-----------+-----------+-----------+-----------|
| [5] 15A | [6] 10A | [7] 20A | [8] 15A |
| HEATER | MARKER | STOP | BACKUP |
|-----------+-----------+-----------+-----------|
| [9] 30A | [10] 10A | [11] 20A | [12] 15A |
| P/WINDOW | RADIO | TRL RUN | A/C |
+-------------------------------------------------+
This panel uses ATC / ATO blade fuses.
| Fuse Position | Amp Rating | Circuit / Component Protected | | :--- | :--- | :--- | | 1 | 15A | Stop lamps, turn signals, hazard flashers | | 2 | 10A | Instrument cluster gauges (fuel, temp, oil pressure) | | 3 | 15A | Dome light, clearance/marker lights, dash backlighting | | 4 | 20A | Windshield wiper motor & washer pump | | 5 | 10A | Radio memory, power port (cigarette lighter) - key-off power | | 6 | 15A | Heater blower motor (low/med/high speed) | | 7 | 10A | Right-hand low beam headlamp | | 8 | 10A | Left-hand low beam headlamp | | 9 | 10A | Right-hand high beam headlamp | | 10 | 10A | Left-hand high beam headlamp & high beam indicator | | 11 | 5A | Instrument cluster illumination (dimmer controlled) | | 12 | 20A | Power door locks (if equipped), cab power seat | | 13 | 10A | A/C clutch relay, engine ECM (if electronic) | | 14 | 15A | Backup lamps, trailer reverse lights | | 15 | 30A (Circuit breaker) | Electric trailer brake controller (if factory wired) | | 16 | 25A (Circuit breaker) | Power window circuit (if equipped) | Diagram 1: Interior Fuse Panel (Under Dash, Left
While wire colors and positions could be custom-ordered, a standard 1994 FL80 cab fuse block generally follows this pattern (standard ISO relay logic applies to the relays):
| Fuse Position (Typical) | Amperage | Circuit Protected | | :--- | :--- | :--- | | F1 | 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 |