Some high-amperage fuses or circuit breakers (such as those for the starter or heavy lighting) may be located in a weatherproof box near the battery box or on the firewall. Understanding the Fuse Box Diagram (Common Layout)
Most FL-series trucks from this era house the main fuse and relay panel behind a plastic cover in the lower center dash area, below the radio or cup holders. 1994 freightliner fl80 fuse box diagram
The hazard fuse is often the same fuse powering the turn signals. Look for the 20-amp fuse in the third position from the left on the top row. If the fuse is good, the issue might be the flasher relay itself. 3. General Power Loss Some high-amperage fuses or circuit breakers (such as
Note: Amps and assignment vary. Always verify with your truck’s diagram. Look for the 20-amp fuse in the third
: Tail lights and turn signals are frequently on separate circuits; if one side is out, check for a dedicated left/right fuse.
Typically protected by a 20 amp fuse , often found in the third position from the top on the left side.
The FL80 platform uses standard blade-type fuses (ATC/ATO) alongside mechanical plug-in relays and thermal circuit breakers. The panel is organized into a grid system. Below is the typical circuit layout for a 1994 model year configuration. Main Fuse Panel Allocation Circuit / Component Protected Amperage Rating Turn Signals / Hazard Flashers Light Blue ATC F2 Instrument Cluster / Gauges / Warning Chimes F3 Horn Assembly Light Blue ATC F4 Headlights (Low Beam) Yellow ATC F5 Headlights (High Beam) / Indicator Light Yellow ATC F6 Marker Lights / Tail Lights / Clearance Lamps Light Blue ATC F7 Windshield Wiper Motor & Washer Pump Circuit Breaker F8 Cab Heater, Ventilation & AC (HVAC) Blower Motor Green ATC / CB F9 Stop Lights / Brake Switch Light Blue ATC F10 Radio / Accessory Outlet / Cigar Lighter Light Blue ATC F11 Engine Control Module (ECM) Ignition Power Red/Blue ATC F12 Backup Lights / Neutral Safety Switch F13 Dome Light / Map Lights / Auxiliary Clock F14 Heated Mirrors (If Equipped) Light Blue ATC F15 Air Dryer / ABS Module Power (If Equipped) Yellow ATC Main Relay Array
