2016 Isuzu NPR — Fuse Box Diagram + Amperage

Quick Answer

The 2016 Isuzu NPR typically has two fuse box locations: one under the hood and one inside the cabin, usually behind a kick panel on the driver's side.

Under-Hood Fuse Box

This fuse box contains fuses and relays for major components like the engine control module (ECM), fuel pump, headlights, and ABS. Always consult the diagram on the fuse box lid for the most accurate information, as variations can occur based on specific vehicle configurations and options.

Cabin Fuse Box (Driver's Side Kick Panel)

This fuse box primarily handles accessories and interior electrical components. It's commonly found behind a removable panel on the driver's side, near the kick panel or under the dashboard. Again, verify with your vehicle's specific fuse box lid diagram.

How to Test a Fuse

Testing a fuse is a straightforward process and requires a fuse puller (usually found in the fuse box or tool kit) and a multimeter or a circuit tester.

1. Locate the Fuse Box: Identify the fuse box relevant to the circuit you're troubleshooting.
2. Identify the Suspect Fuse: Consult the fuse box diagram to find the fuse associated with the malfunctioning component.
3. Remove the Fuse: Use the fuse puller to carefully remove the fuse.
4. Visually Inspect: Many fuses have a visible wire inside. If this wire is broken or melted, the fuse is blown. However, sometimes a blown fuse isn't visually obvious.
5. Test with a Multimeter:
   • Set your multimeter to the continuity setting (usually indicated by an audible beep or an ohm symbol).
   • Touch one probe to each metal blade of the fuse.
   • If the multimeter beeps or shows a reading close to zero ohms, the fuse is good. If there's no beep or an "OL" (open loop) reading, the fuse is blown.
6. Test with a Circuit Tester (Test Light):
   • Connect the alligator clip of the test light to a good ground point on the vehicle.
   • With the fuse still installed and the ignition on (if applicable for the circuit), touch the tip of the test light to the small metal test points on the top of the fuse (if present). You should get light on both sides of the fuse. If you only get light on one side or no light at all, the fuse is blown.
7. Replace the Fuse: If the fuse is blown, replace it with a new fuse of the exact same amperage and type. Never use a fuse with a higher amperage rating, as this can lead to serious electrical damage or fire.

Common Blown Fuses on This Vehicle

While specific blown fuses can vary depending on usage and electrical demands, some common culprits on commercial vehicles like the Isuzu NPR often include those protecting high-draw accessories or circuits prone to shorts.

• Cigar Lighter / 12V Power Outlets: These fuses are frequently blown due to over-Gladen devices, faulty accessory plugs, or shorts within the charging cables. If your phone charger or other accessories aren't working, check these first.
• Brake Lights: Blown brake light fuses can occur due to a short in the wiring, a faulty brake light switch, or issues with trailer wiring if equipped. If your brake lights aren't working, this is a good place to start troubleshooting.
• Blower Motor: A seized blower motor, a clogged cabin air filter causing the motor to overwork, or shorts in the blower motor resistor can lead to this fuse blowing. If your HVAC fan isn't working, inspect this fuse.
• Trailer Brake Controller: If your NPR is equipped with a trailer brake controller and you experience issues with trailer braking, check the dedicated fuse for this system. Shorts in trailer wiring are a common cause.
• Headlights: While less common than accessory fuses, a short in the headlight circuit or a faulty bulb can cause a headlight fuse to blow, though modern headlight systems often have individual fuses per bulb/side.

Always remember to check the printed legend on the fuse box lid or in your owner's manual for the most accurate and up-to-date fuse information specific to your 2016 Isuzu NPR. Trim variations can lead to differences in fuse assignments.

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