This page lists 8 electrical switch & relay parts for the 2012 Isuzu NPR, across 4 part types, covering all 3 engine options (3.0L L4 DIESEL Turbocharged, 5.2L L4 DIESEL Turbocharged and 6.0L V8). Every part shows its brand, manufacturer part number and fitment notes.
On the 2012 Isuzu NPR, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. Most of the listed parts are A/C Trinary Switch (3 parts), Oil Pressure Sender / Switch (3 parts) and A/C Compressor Relay (1 part). The other 1 part type covers the remaining 1 part.
The 2012 Isuzu NPR was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
5 brands supply electrical switch & relay parts for the 2012 Isuzu NPR, led by FOUR SEASONS (3 parts), UAC (2 parts) and ULTRA-POWER (1 part), plus 2 more brands. Quality grades include Standard Replacement and Economy.
Each part number listed for the 2012 Isuzu NPR opens a page with every vehicle that part fits.
A/C Compressor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: 6.0L V8 | 36141 | 🇺🇸 US 🇨🇦 CA | with 10S17F CompressorRecommended To Eliminate Compressor Damage On Vehicles with Low Mount Compressor | View on Amazon |
This table covers the relays that control the A/C Compressor circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
One part is listed for the 2012 Isuzu NPR — FOUR SEASONS 36141.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: 6.0L V8 | 20915 | 🇺🇸 US 🇨🇦 CA | Pressure Switch | View on Amazon |
This table covers the pressure switches on the A/C circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
One part is listed for the 2012 Isuzu NPR — FOUR SEASONS 20915.
A/C Trinary Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: 3.0L L4 DIESEL Turbocharged, 6.0L V8 | 20944 | 🇺🇸 US 🇨🇦 CA | Pressure Switch | View on Amazon |
| UAC Fits: 3.0L L4 DIESEL Turbocharged, 6.0L V8 | SW4004C | 🇺🇸 US 🇨🇦 CA | Trinary HPCO CF LPCO | View on Amazon |
| UAC Fits: 3.0L L4 DIESEL Turbocharged, 6.0L V8 | SW11276C | 🇺🇸 US 🇨🇦 CA | Trinary Switch | View on Amazon |
This table covers the A/C Trinary switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
3 A/C Trinary Switch parts for the 2012 Isuzu NPR come from 2 brands — UAC and FOUR SEASONS.
Part numbers include FOUR SEASONS 20944, UAC SW4004C and UAC SW11276C.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ULTRA-POWER Fits: 6.0L V8 | PS508 | 🇺🇸 US 🇨🇦 CA | Oil Pressure Sender or Switchwith Gauge | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 6.0L V8 | PS508 | 🇺🇸 US 🇨🇦 CA | Includes Filter Screen | View on Amazon |
| WELLS Fits: 6.0L V8 | 1S10842 | 🇺🇸 US 🇨🇦 CA | NPR Base Model | View on Amazon |
This table covers the senders and switches that report oil pressure to the gauge or lamp. Typical signs include a lamp that stays on, or a gauge that never moves. Confirm power and ground at the connector before replacing the sender or switch.
3 Oil Pressure Sender / Switch parts are listed for the 2012 Isuzu NPR, from ULTRA-POWER, STANDARD MOTOR PRODUCTS and WELLS.
In the Economy grade, ULTRA-POWER supplies 1 part: the catalog's value-priced group. A representative part number is ULTRA-POWER PS508.
The Standard Replacement section lists 2 options from STANDARD MOTOR PRODUCTS and WELLS — built to original-equipment specification. STANDARD MOTOR PRODUCTS PS508 is listed in this group.
Listed part numbers: ULTRA-POWER PS508 and WELLS 1S10842, plus the other parts above.
Buying Electrical Switch & Relay Parts for a 2012 Isuzu NPR
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Match the engine first. Every electrical switch & relay part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: A/C Trinary Switch and Oil Pressure Sender / Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2012 Isuzu NPR?
Our catalog currently lists 8 electrical switch & relay parts for the 2012 Isuzu NPR across 4 subcategories and 5 brands, covering all 3 engine options (3.0L L4 DIESEL Turbocharged, 5.2L L4 DIESEL Turbocharged and 6.0L V8). Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2012 Isuzu NPR engines?
Yes. Every electrical switch & relay part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical switch & relay problems on a 2012 Isuzu NPR?
Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2012 Isuzu NPR was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2012 Isuzu NPR?
First match the engine — each row shows which engine(s) the part fits. Then swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2012 Isuzu NPR
Electrical Switch & Relay Parts for Other Isuzu NPR Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.