2014 Kenworth W900 Fuse Box Diagram & Amperage
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Quick answer:
The 2014 Kenworth W900 typically has multiple fuse box locations to manage its extensive electrical systems:
- Under-hood Fuse Box: Located in the engine compartment, usually on the driver's side, often integrated with the power distribution center.
- In-cab Fuse Panel (Driver's Side Kick Panel): This is the primary fuse panel for many cabin accessories and essential vehicle functions.
- Behind Passenger Kick Panel: Some W900 models may have additional fuse boxes or relay banks behind the passenger kick panel, often for body builder circuits or specific optional equipment.
Under-hood Fuse Box
The under-hood fuse box on your 2014 Kenworth W900, often referred to as a Power Distribution Center (PDC), houses high-amperage fuses and relays for critical systems like the ECM, fuel pump, and major lighting circuits. Always consult the legend printed on the inside of the fuse box cover for the most accurate information for your specific truck's trim and options.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | ECM (Engine Control Module) Power |
| F2 | 15A | Blue | Fuel Pump Relay Control |
| F3 | 20A | Yellow | Ignition Switch Feed |
| F4 | 30A | Green | Starter Relay Control |
| F5 | 20A | Yellow | Headlights Low Beam (Left) |
| F6 | 20A | Yellow | Headlights Low Beam (Right) |
| F7 | 15A | Blue | Headlights High Beam (Left) |
| F8 | 15A | Blue | Headlights High Beam (Right) |
| F9 | 10A | Red | ABS (Anti-lock Braking System) Module Power |
| F10 | 30A | Green | Blower Motor High Speed |
| F11 | 20A | Yellow | A/C Clutch Relay |
| F12 | 10A | Red | Trailer ABS Power |
| F13 | 20A | Yellow | Trailer Brake Control Module |
| F14 | 10A | Red | DRL (Daytime Running Lights) Module |
| F15 | 15A | Blue | Horn |
Relay Locations (Under-hood):
- RL1: ECM Power Relay
- RL2: Fuel Pump Relay
- RL3: Starter Relay
- RL4: Headlight High Beam Relay
- RL5: Headlight Low Beam Relay
- RL6: Blower Motor Relay
- RL7: A/C Clutch Relay
- RL8: Trailer ABS Relay
In-cab Fuse Panel (Driver's Side Kick Panel)
This fuse panel is located behind the kick panel on the driver's side of the cab. It contains fuses for various interior accessories and less critical, but still important, vehicle functions. The exact layout can vary slightly depending on your W900's specific options and build year. Always refer to your truck's owner's manual or the fuse box lid diagram for the most accurate information.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | Radio / Infotainment System |
| F2 | 15A | Blue | Cigar Lighter / 12V Outlet (Dash) |
| F3 | 10A | Red | Interior Cabin Lights |
| F4 | 10A | Red | Accessory Power Outlet (Sleeper) |
| F5 | 5A | Tan | Instrument Cluster |
| F6 | 10A | Red | Turn Signals / Hazard Lights |
| F7 | 15A | Blue | Wiper Motor |
| F8 | 10A | Red | Washer Pump |
| F9 | 10A | Red | Power Windows (Driver) |
| F10 | 10A | Red | Power Windows (Passenger) |
| F11 | 15A | Blue | Power Mirrors / Heated Mirrors |
| F12 | 20A | Yellow | HVAC Blower Motor (Lower Speeds) |
| F13 | 10A | Red | Dome Lights |
| F14 | 10A | Red | Cruise Control Module |
| F15 | 10A | Red | ABS Warning Lamp |
| F16 | 10A | Red | Airbag System (SRS) Module |
| F17 | 15A | Blue | Brake Lights / Stop Lamps |
| F18 | 5A | Tan | Parking Lights / Tail Lights (Left) |
| F19 | 5A | Tan | Parking Lights / Tail Lights (Right) |
| F20 | 10A | Red | Trailer marker lights |
| F21 | 10A | Red | Diagnostics Port (OBD-II/J1939) |
| F22 | 15A | Blue | Auxiliary Power Socket |
| F23 | 10A | Red | Sleeper HVAC Controls |
| F24 | 10A | Red | Sleeper Lighting |
Relay Locations (In-cab, may be integrated or nearby):
- RL1: HVAC Blower Relay (Lower Speeds)
- RL2: Wiper Motor Relay
- RL3: Turn Signal Flasher Relay
How to test a fuse
Testing a fuse is a straightforward process that can help you diagnose electrical issues. Here's how to do it:
- Safety First: Turn off the ignition and any affected electrical components. It's also a good idea to disconnect the negative terminal of the battery if you're working with high-amperage fuses.
- Locate the Fuse Box: Find the appropriate fuse box for the circuit you suspect has an issue.
- Identify the Suspect Fuse: Refer to the fuse box diagram (either in your owner's manual or on the fuse box lid) to locate the fuse for the problematic component.
- Visual Inspection: Pull the fuse out using a fuse puller (usually found in the fuse box lid) or small needle-nose pliers. Hold it up to the light. If the metal wire or strip inside the fuse is broken or burnt, the fuse is blown and needs to be replaced.
- Use a Multimeter (for a more thorough test):
- Set your multimeter to the continuity or ohm setting.
- Touch one probe of the multimeter to each metal terminal on the fuse (the two exposed metal prongs). A good fuse will show a near-zero resistance reading or a continuity beep. If the multimeter reads
Before you pull a fuse on the 2014 Kenworth W900
- 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 2014 Kenworth W900
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
2014 Kenworth W900 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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