2014 Isuzu NPR Fuse Box Diagram & Amperage
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Quick answer
The 2014 Isuzu NPR features two main fuse box locations: one under the hood and another inside the cab on the driver's side kick panel. There is no fuse box located in the trunk or cargo area of this vehicle, as it is a commercial truck.
Under-hood Fuse Box
The under-hood fuse box on your 2014 Isuzu NPR is located on the driver's side, near the battery. It houses fuses and relays for critical engine functions, lighting, and other high-current components. Always verify the specific fuse layout against the diagram on the inside of the fuse box cover, as configurations can vary slightly due to trim levels and optional equipment.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | ECM / PCM Power |
| F2 | 15A | Blue | Fuel Pump |
| F3 | 20A | Yellow | Ignition Coils / System Power |
| F4 | 20A | Yellow | Starter Relay / Solenoid |
| F5 | 10A | Red | ABS System / Module |
| F6 | 30A | Green | Headlights (Low Beam, Left) |
| F7 | 30A | Green | Headlights (Low Beam, Right) |
| F8 | 15A | Blue | Headlights (High Beam, Left) |
| F9 | 15A | Blue | Headlights (High Beam, Right) |
| F10 | 20A | Yellow | Blower Motor (High Speed) |
| F11 | 10A | Red | A/C Clutch |
| F12 | 10A | Red | Horn |
| F13 | 20A | Yellow | Trailer Brake Controller (Main) |
| F14 | 10A | Red | Tail Lights / Parking Lights (Left) |
| F15 | 10A | Red | Tail Lights / Parking Lights (Right) |
| F16 | 15A | Blue | Wiper Motor |
| F17 | 30A | Green | Main Power Supply |
| F18 | 10A | Red | ECM / PCM Sensors |
| F19 | 10A | Red | Transmission Control Module (TCM) |
| F20 | 10A | Red | Brake Lights (Stop Lights) |
Relay Locations (Under-hood):
The Under-hood fuse box also houses several important relays:
- R1: Main Relay: Powers various engine and electrical systems.
- R2: Fuel Pump Relay: Controls power to the fuel pump.
- R3: Starter Relay: Engages the starter motor.
- R4: Headlight Relay (Low Beam): Controls the low beam headlights.
- R5: Headlight Relay (High Beam): Controls the high beam headlights.
- R6: Blower Motor Relay: Controls operation of the blower motor.
- R7: A/C Clutch Relay: Activates the air conditioning compressor clutch.
Cabin Fuse Box (Driver's Side Kick Panel)
The cabin fuse box in your 2014 Isuzu NPR is located on the driver's side, behind a removable panel in the kick panel area. This fuse box typically controls interior accessories, infotainment, convenience features, and some critical safety systems. Always consult the diagram on the fuse box cover for the most accurate information specific to your vehicle.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| C1 | 10A | Red | Radio / Infotainment System |
| C2 | 15A | Blue | Cigar Lighter / 12V Power Outlet (Front) |
| C3 | 10A | Red | ABS Module Power (Interior) |
| C4 | 10A | Red | Airbag System (SRS) |
| C5 | 10A | Red | Instrument Cluster / Gauges |
| C6 | 10A | Red | Interior Lights (Dome, Courtesy) |
| C7 | 15A | Blue | Power Windows (Driver) |
| C8 | 15A | Blue | Power Windows (Passenger) |
| C9 | 10A | Red | Power Door Locks |
| C10 | 20A | Yellow | Blower Motor (Low/Medium Speed) |
| C11 | 10A | Red | Turn Signals / Hazard Lights |
| C12 | 5A | Tan | ECM / PCM Keep Alive Memory (KAM) |
| C13 | 15A | Blue | Auxiliary 12V Power Outlet (Rear/Console) |
| C14 | 10A | Red | Wiper Motor (Park Function) |
| C15 | 10A | Red | Washer Pump Motor |
| C16 | 7.5A | Brown | OBD-II Diagnostic Port |
| C17 | 10A | Red | Trailer Brake Controller (Cabin) |
| C18 | 5A | Tan | Cruise Control System |
| C19 | 15A | Blue | Driver Seat Power |
| C20 | 10A | Red | HVAC Control Panel |
Relay Locations (Cabin):
Within the cabin fuse box or adjacent to it, you may find relays for certain interior functions, although they are less common here compared to the under-hood box. Common cabin relays might include:
- CR1: Accessory Relay: Powers various accessory circuits when the ignition is on.
- CR2: Power Window Relay: Supplies power to the window motors.
How to Test a Fuse
Before replacing a fuse, it's important to confirm it's actually blown. Here's how to test a fuse:
- Safety First: Always turn off the ignition and anyAffected circuits before working with fuses.
- Visually Inspect: Many fuses (especially the common blade-type) have a visible wire inside. If this wire is broken or melted, the fuse is blown. Most modern fuse boxes also have small test points on top of each fuse.
- Use a Multimeter: Set your multimeter to the continuity or ohm setting. Touch the probes to the test points on top of the fuse. A good fuse will show continuity (a beep or a reading close to 0 ohms). A blown fuse will show no continuity or an
Before you pull a fuse on the 2014 Isuzu NPR
- 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.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work
More specs for the 2014 Isuzu NPR
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 Isuzu NPR 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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