2017 Isuzu NPR Fuse Box Diagram & Amperage

Quick Answer

The 2017 Isuzu NPR typically has two main fuse box locations: one under the hood and another inside the cabin, usually behind a kick panel on the driver's side.

Under-Hood Fuse Box

The under-hood fuse box generally houses fuses and relays for critical engine components, lighting, and other high-current systems. It's usually located on the driver's side, near the battery or fender.

Common Fuses and Relays:

Note: Fuse locations and amperages can vary slightly depending on the specific trim level and options of your 2017 Isuzu NPR. Always refer to the fuse diagram printed on the inside of your fuse box lid for the most accurate information.

Cabin Fuse Box (Interior)

The interior fuse box is typically located on the driver's side of the cabin, often behind a kick panel near the footwell or under the dashboard. This fuse box protects accessories, interior lights, and various body electrical systems.

Common Fuses:

Note: As with the under-hood box, specific fuse assignments may vary. Always consult your owner's manual or the diagram on the fuse box cover for confirmation.

How to Test a Fuse

Testing a fuse is a straightforward process that can save you time and money on diagnostics. Here's how:

1. Locate the Fuse Box: Identify the correct fuse box for the circuit you're troubleshooting.
2. Identify the Suspect Fuse: Refer to the fuse diagram (either in this article, on your fuse box lid, or in your owner's manual) to find the fuse associated with the malfunctioning component.
3. Visual Inspection: Most modern fuses are transparent, allowing for a quick visual check. Look for a broken or melted wire (filament) inside the fuse. If it's broken, the fuse is blown.
4. Use a Fuse Tester or Multimeter: For a more definitive test, or for opaque fuses, use a fuse tester or a multimeter set to continuity mode.
   • With a Fuse Tester: Many automotive fuse testers have two prongs. Simply touch one prong to each metal contact point on top of the fuse. If the tester lights up, the fuse is good. If it doesn't, the fuse is blown.
   • With a Multimeter: Remove the fuse from its slot. Touch one probe of the multimeter to each metal blade of the fuse. If your multimeter beeps or shows a reading of 0 ohms, the fuse has continuity and is good. If it shows "OL" (open loop) or no reading, the fuse is blown and needs replacement.
5. Replace the Blown Fuse: Always replace a blown fuse with a new one of the exact same amperage rating (number and color). Using a fuse with a higher amperage can lead to serious electrical damage or fire.

Common Blown Fuses on This Vehicle

While any fuse can blow, some circuits are prone to experiencing issues due to their constant use or the components they protect. On a 2017 Isuzu NPR, common blown fuses often include:

• Cigar Lighter / 12V Outlets: These fuses frequently blow due to overloads from charging multiple devices, using high-power accessories, or faulty devices plugged into the outlet. If your phone charger or accessory isn't working, check this fuse first.
• Blower Motor: The blower motor fuse can blow if the motor itself is starting to fail, drawing too much current, or if there's a blockage in the HVAC system putting strain on the motor. If your fan isn't working, this is a prime suspect.
• Headlights / Tail Lights: While less common for modern vehicles, a short circuit in a bulb or wiring can occasionally cause a headlight or tail light fuse to blow. If one side of your lighting is out, check the corresponding fuse.
• Radio / Infotainment: Issues with aftermarket head units, faulty wiring, or even a sudden power surge can sometimes lead to the radio fuse blowing. If your radio is completely dead, this fuse is worth checking.

What to Check First:

When troubleshooting an electrical issue, always start with the most obvious and easiest checks:

1. Is it just one component, or multiple? If multiple components are out, especially if they are on different circuits, it might be a larger issue like a main power fuse or relay, or even a battery problem.
2. Visual Inspection: Before pulling out your multimeter, a quick glance at the fuse can often tell you if it's blown.
3. Related Circuits: Consider what other components share a circuit with the malfunctioning item. A short in one component can affect others on the same fuse.

Finding the right fuse and knowing how to test it can help you quickly resolve minor electrical problems and keep your Isuzu NPR running smoothly.

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