| Fuse # | Amperage | Circuit / Component | Common Failure Symptom | |--------|----------|---------------------|------------------------| | 1 | 10A | Left Headlight (Low) | No low beam on driver side | | 2 | 10A | Right Headlight (Low) | No low beam on passenger side | | 3 | 10A | Left Headlight (High) | No high beam left | | 4 | 10A | Right Headlight (High) | No high beam right | | 5 | 15A | Turn Signals / Hazard Flashers | No blinkers or rapid flashing | | 6 | 20A | Brake Lights & Horn | No brake lights; horn dead | | 7 | 25A | HVAC Blower Motor | Heater fan won’t run on any speed | | 8 | 10A | Instrument Cluster (Gauges) | Dead speedo, tach, fuel gauge | | 9 | 15A | Clearance / Marker Lights | No side marker lights | | 10 | 20A | Tail & Parking Lights | No rear tails or dash backlight | | 11 | 10A | Radio / Cigarette Lighter | Radio dead; no power to charger | | 12 | 25A | Wiper / Washer Motor | Wipers stuck or slow | | 13 | 10A | Backup Lights & Neutral Safety | No reverse lights; hard to start | | 14 | 15A | ABS System (if equipped) | ABS light on, no wheel speed data | | 15 | 5A | ECM Ignition Feed (Cummins) | Engine cranks but won’t start | | 16 | 30A Circuit Breaker | Power Windows (if equipped) | Windows won’t move |
Pull the fuse using a fuse puller tool. Look for a broken metal filament inside the plastic housing. 1994 freightliner fl80 fuse box diagram