2018 Kenworth T680 Fuse Box Diagram & Amperage
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Quick Answer
The 2018 Kenworth T680 typically has three main fuse box locations:
- Under-Hood Power Distribution Center (PDC): Located on the driver's side, near the firewall.
- In-Cab Fuse Panel (Lower Dash): Typically found behind a removable panel on the passenger side kick panel.
- Sleeper Area Fuse Panel: Located within the sleeper compartment, often behind a panel or near the bunk.
Under-Hood Power Distribution Center (PDC)
The under-hood PDC houses critical fuses and relays for major vehicle systems, including engine management, high-amperage accessories, and several lighting circuits. Always refer to the legend on the lid of your specific vehicle's PDC for precise fuse identification, as configurations can vary by trim and installed options.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20A | Yellow | ECM/PCM (Engine Control Module) Power |
| F2 | 15A | Blue | Fuel Pump Relay Control |
| F3 | 30A | Green | Ignition Switch Main Feed |
| F4 | 20A | Yellow | Starter Relay Supply |
| F5 | 15A | Blue | Headlights Low Beam (Driver Side) |
| F6 | 15A | Blue | Headlights Low Beam (Passenger Side) |
| F7 | 15A | Blue | Headlights High Beam (Driver Side) |
| F8 | 15A | Blue | Headlights High Beam (Passenger Side) |
| F9 | 10A | Red | Marker Lights / Clearance Lights |
| F10 | 20A | Yellow | ABS (Anti-lock Brake System) |
| F11 | 30A | Green | Blower Motor High Speed |
| F12 | 10A | Red | HVAC Blower Motor Control |
| F13 | 10A | Red | A/C Clutch Relay Control |
| F14 | 20A | Yellow | Trailer Brake Control Module |
| F15 | 10A | Red | Horn |
Relay Locations (Under-Hood PDC):
- K1: ECM Main Relay
- K2: Fuel Pump Relay
- K3: Starter Relay
- K4: Headlight High Beam Relay
- K5: Headlight Low Beam Relay
- K6: ABS Pump Relay
- K7: Blower Motor Relay
- K8: A/C Clutch Relay
In-Cab Fuse Panel (Lower Dash)
The in-cab fuse panel, typically located behind a removable access panel on the passenger side kick panel, handles fuses for interior accessories, comfort features, and some communication systems. Always verify the fuse panel legend for your specific vehicle.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | Radio/Infotainment System |
| F2 | 15A | Blue | 12V Power Outlet (Dashboard CIGAR) |
| F3 | 5A | Tan | Instrument Cluster / Gauge Backlighting |
| F4 | 10A | Red | Wiper Motor Control |
| F5 | 15A | Blue | Turn Signals / Hazard Lights |
| F6 | 10A | Red | Interior Cabin Lights |
| F7 | 5A | Tan | Diagnostic Port (OBD-II) |
| F8 | 10A | Red | Airbag Control Module (SRS) |
| F9 | 10A | Red | Brake Lights / Stop Lamps |
| F10 | 15A | Blue | Power Windows (Driver) |
| F11 | 15A | Blue | Power Windows (Passenger) |
| F12 | 10A | Red | HVAC Control Panel |
| F13 | 5A | Tan | Cruise Control Module |
| F14 | 10A | Red | Mirror Adjust/Heater |
| F15 | 15A | Blue | CB Radio / Auxiliary Power |
Relay Locations (In-Cab Fuse Panel):
- R1: Accessory Delay Relay
- R2: Wiper Motor Relay
- R3: Turn Signal Flasher Relay
Sleeper Area Fuse Panel
This fuse panel is dedicated to the various amenities and lighting within the sleeper compartment. Its exact location can vary, but it
Before you pull a fuse on the 2018 Kenworth T680
- Use the label printed on the panel cover or the owner's manual for your exact build. Layouts change with options, model year and build date, so a chart for another truck can be wrong.
- Replace a blown fuse only with the same amp rating. A larger fuse can let wiring overheat.
- A fuse that blows again right away means a short or failing component downstream. Find the cause before replacing it again.
- A good fuse doesn't prove the circuit works — relays, grounds and connectors fail too.
- Many heavy trucks have more than one power distribution point (cab, under-hood or near the batteries), and some circuits use circuit breakers instead of fuses. Some systems have 24-volt starting circuits; confirm the voltage before testing.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work · Find mobile truck repair
More specs for the 2018 Kenworth T680
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2018 Kenworth T680 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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