2017 Kenworth T680 Fuse Box Diagram
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Quick answer
Your 2017 Kenworth T680 has two main fuse box locations:
- Under the Hood: Located on the driver's side, near the firewall.
- In the Cab: Found in the kick-panel on the passenger side.
Under-Hood Fuse Box
This fuse box primarily houses the high-amperage fuses and relays that control the engine and chassis components.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 60A | Yellow | Trailer Power |
| F2 | 30A | Green | ABS |
| F3 | 20A | Blue | Ignition Switch |
| F4 | 30A | Green | Engine Control Module (ECM) |
| F5 | 20A | Blue | Fuel Pump |
| F6 | 15A | Light Blue | Horn |
| F7 | 20A | Blue | Headlights (Low Beam) |
| F8 | 20A | Blue | Headlights (High Beam) |
| F9 | 15A | Light Blue | Marker Lights |
| F10 | 10A | Red | Brake Lights |
| R1 | - | - | Starter Relay |
| R2 | - | - | A/C Clutch Relay |
| R3 | - | - | Fuel Pump Relay |
Passenger-Side Kick-Panel Fuse Box
This fuse box contains the fuses for the cab accessories and other interior components.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 15A | Light Blue | Radio/Infotainment System |
| F2 | 10A | Red | Ignition |
| F3 | 20A | Blue | Cigar Lighter / 12V Outlet |
| F4 | 30A | Green | Blower Motor |
| F5 | 15A | Light Blue | Airbag System |
| F6 | 10A | Red | Instrument Cluster |
| F7 | 15A | Light Blue | Trailer Brake Controller |
| F8 | 10A | Red | Dome Lights |
| F9 | 15A | Light Blue | Power Windows |
| F10 | 20A | Blue | Sleeper Power Outlets |
Note: Fuse numbers and circuits can vary based on your truck's specific trim and options. Always consult the diagram on the fuse box cover to verify the correct fuse for the circuit in question.
How to Test a Fuse
A blown fuse is a common and usually easy-to-fix problem. Here's how to test a fuse:
- Turn off the ignition and all accessories.
- Locate the fuse box and remove the cover.
- Visually inspect the fuse. A good fuse will have an unbroken filament (the small wire inside). A blown fuse will have a broken or melted filament.
- Use a multimeter or a test light to check for continuity. If you can't see the filament, you can test the fuse with a multimeter set to the continuity setting. Place the probes on each of the fuse's metal tabs. If the multimeter beeps or shows a reading, the fuse is good. If it doesn't, the fuse is blown.
Common Blown Fuses on this Vehicle
- Cigar Lighter / 12V Outlet Fuse: This is one of the most common blown fuses, often due to a faulty phone charger or other accessory. If you find this fuse blown, inspect the accessory you were using for any signs of damage before replacing the fuse.
- Trailer Power Fuse: If your trailer lights or other trailer-mounted accessories aren't working, this fuse is the first thing to check. A faulty trailer wiring connection is a common cause of this fuse blowing.
- Fuel Pump Fuse: A failing fuel pump can cause this fuse to blow. If you replace the fuse and it blows again, the fuel pump may need to be replaced.
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Before you pull a fuse on the 2017 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 2017 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
2017 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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