2019 Kenworth T680 Fuse Box Diagram
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Quick answer
Your 2019 Kenworth T680 has two main fuse box locations:
- Under the Hood: Located near the firewall on the driver's side.
- In the Cab: Behind a kick panel on the passenger side, near the floor.
Under-Hood Fuse Box
This fuse box primarily contains high-amperage fuses and relays for major vehicle systems.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 60A | Yellow | Trailer ABS |
| F2 | 30A | Green | Trailer Marker Lights |
| F3 | 20A | Yellow | Fuel Heater |
| F4 | 30A | Green | Ignition Switch |
| F5 | 40A | Orange | Cab Power |
| F6 | 50A | Red | Main Power Relay |
| F7 | 30A | Green | ECM/PCM |
| F8 | 20A | Yellow | Headlights (Low Beam) |
| F9 | 20A | Yellow | Headlights (High Beam) |
| F10 | 15A | Blue | Horn |
| R1 | - | - | Starter Relay |
| R2 | - | - | Ignition Relay |
| R3 | - | - | Fuel Pump Relay |
| R4 | - | - | A/C Clutch Relay |
In-Cab Fuse Box
This fuse box handles most of the interior and accessory circuits.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 15A | Blue | Radio/Infotainment |
| F2 | 10A | Red | Airbag System |
| F3 | 20A | Yellow | Cigar Lighter / 12V Outlet |
| F4 | 10A | Red | Gauges / Instrument Cluster |
| F5 | 30A | Green | Blower Motor |
| F6 | 15A | Blue | ABS Control Module |
| F7 | 10A | Red | Tail/Park Lights |
| F8 | 15A | Blue | Brake Lights |
| F9 | 20A | Yellow | Trailer Brake Controller |
| F10 | 10A | Red | Dome Lights |
How to test a fuse
To test a fuse, you will need a fuse puller (often found in the fuse box lid) and a multimeter or a 12V test light.
- Turn the ignition off.
- Remove the fuse you want to test.
- Visually inspect the fuse. If the metal strip inside is broken, the fuse is blown.
- If you can't see the strip, use a multimeter set to continuity. Place a probe on each of the fuse's metal tabs. If the multimeter beeps or shows a reading of 0 ohms, the fuse is good. If it doesn't, the fuse is blown.
- Alternatively, use a 12V test light. Connect the test light's clip to a good ground point. With the ignition on (or the circuit active), touch the test light probe to both metal tabs on the back of the fuse. If the test light illuminates on both sides, the fuse is good. If it only lights up on one side, the fuse is blown.
Common blown fuses on this vehicle
- Cigar Lighter / 12V Outlet: This fuse often blows due to faulty phone chargers or other accessories. Before replacing the fuse, unplug everything from the outlets.
- Trailer Lights: If your trailer lights aren't working, check the trailer light fuses in the under-hood fuse box. A short in the trailer wiring is a common cause.
- Headlights: If one of your headlights is out, it's likely the bulb. If both are out, check the fuses. If the fuses are good, the problem could be the headlight relay or the switch itself.
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Before you pull a fuse on the 2019 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 2019 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
2019 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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