2019 Isuzu NPR – Fuse Box Diagram & Amperage
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Quick Answer
The 2019 Isuzu NPR typically has three main fuse box locations: under the hood (engine compartment), behind the driver's side kick panel (cabin), and sometimes a dedicated fuse box for body and accessory circuits, which on some trims may be located in the cabin or near the battery.
Under-Hood Fuse Box
This fuse box is located in the engine compartment, usually on the driver's side. It houses fuses and relays for critical engine functions, lighting, and other high-current components.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | ECM/PCM (Engine Control Module/Powertrain Control Module) |
| F2 | 15A | Blue | Fuel Pump |
| F3 | 20A | Yellow | Ignition Switch (IGN1 - Engine Circuits) |
| F4 | 30A | Green | Starter Relay |
| F5 | 10A | Red | Headlight (Low Beam, Left) |
| F6 | 10A | Red | Headlight (Low Beam, Right) |
| F7 | 15A | Blue | Headlight (High Beam, Left) |
| F8 | 15A | Blue | Headlight (High Beam, Right) |
| F9 | 10A | Red | Tail Lights |
| F10 | 10A | Red | Parking Lights |
| F11 | 20A | Yellow | ABS (Anti-lock Braking System) |
| F12 | 30A | Green | Blower Motor (Heater/AC) |
| F13 | 10A | Red | A/C Clutch |
| F14 | 25A | Clear | Trailer Brake Controller (if equipped) |
| F15 | 15A Blue | Horn | |
| F16 | 15A Blue | Wipers |
Relay Locations (Under-Hood):
- R1: Fuel Pump Relay
- R2: Starter Relay
- R3: Headlight Relay (Low Beam)
- R4: Headlight Relay (High Beam)
- R5: Horn Relay
- R6: Blower Motor Relay
- R7: A/C Clutch Relay
Cabin Fuse Box (Behind Driver's Side Kick Panel)
This fuse box is located inside the cabin, typically behind a removable panel on the driver's side kick panel. It protects circuits for interior accessories, radio, power outlets, and more.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| C1 | 10A | Red | Radio/Infotainment System |
| C2 | 15A | Blue | Cigar Lighter/12V Power Outlet |
| C3 | 10A | Red | Cabin Interior Lights |
| C4 | 10A | Red | OBD-II Port |
| C5 | 15A | Blue | Power Windows (Driver) |
| C6 | 15A | Blue | Power Windows (Passenger) |
| C7 | 10A | Red | Turn Signals/Hazard Lights |
| C8 | 10A | Red | Instrument Cluster |
| C9 | 5A | Tan | Airbag Control Module (SRS) |
| C10 | 10A | Red | Brake Lights |
| C11 | 10A | Red | Backup Lights |
| C12 | 20A | Yellow | HVAC Control Module |
| C13 | 15A | Blue | Door Locks |
| C14 | 5A | Tan | ABS Control Module (Auxiliary Power) |
Relay Locations (Cabin):
- CR1: Accessory Relay
- CR2: Power Window Relay
- CR3: Turn Signal Flasher Relay
Auxiliary/Body Fuse Box (Refer to Vehicle Specifics)
Some 2019 Isuzu NPR models, especially those with specialized body upfits or extensive accessory packages, may have an additional auxiliary fuse box. This box is often located near the main battery or within the cabin, possibly under the passenger seat or in a storage compartment. Its contents can vary significantly based on the vehicle's specifications and factory/aftermarket installations. Always check your vehicle's owner's manual or the fuse box lid for the exact diagram.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| A1 | 20A | Yellow | Upfitter Switches/Accessory Power |
| A2 | 30A | Green | Trailer Connector (Constant Power) |
| A3 | 15A | Blue | Auxiliary Power Outlet (Cargo Area) |
| A4 | 10A | Red | Telematics/GPS Modules |
| A5 | 20A | Yellow | Body Control Module (Auxiliary Power) |
How to Test a Fuse
Testing a fuse is a straightforward process that can save you time and money. Here's how you do it:
- Locate the fuse box: Refer to the diagrams above for your specific vehicle.
- Identify the suspected fuse: Check your owner's manual or the fuse box lid for the fuse corresponding to the non-working component.
- Visual inspection: Many fuses are clear, allowing you to see if the metal wire inside is broken. If it
Before you pull a fuse on the 2019 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 2019 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
2019 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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