The 2021 International LT has 4 electrical switch & relay parts with verified fitment on this page — 2 part types and 3 brands, covering both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged. Each part includes a manufacturer part number and application notes.
On the 2021 International LT, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. All 4 listed parts are A/C System Relay (2 parts) and Oil Pressure Sender / Switch (2 parts).
The 2021 International LT was sold with both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged. 1 part fits every engine; the other 3 are engine-specific. Each part shows which engine(s) it fits.
3 brands supply electrical switch & relay parts for the 2021 International LT, led by UAC (2 parts), DORMAN (1 part) and GPD (1 part).
Each part number listed for the 2021 International LT opens a page with every vehicle that part fits.
A/C System Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: all 2021 LT engines | RE8434C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| UAC Fits: 14.9L L6 DIESEL Turbocharged | RE1008C | 🇲🇽 MX | View on Amazon |
This table covers the relays that control the A/C System 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.
UAC supplies both parts for the 2021 International LT. 1 part fits every engine; the other 1 is engine-specific.
Part numbers include UAC RE8434C and UAC RE1008C.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 14.9L L6 DIESEL Turbocharged | 9045050 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| GPD Fits: 14.9L L6 DIESEL Turbocharged | 1815437 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
2 Oil Pressure Sender / Switch parts are listed for the 2021 International LT, from DORMAN and GPD.
Listed part numbers: DORMAN 9045050 and GPD 1815437.
Buying Electrical Switch & Relay Parts for a 2021 International LT
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. Some electrical switch & relay parts fit every engine; others are 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 System Relay and Oil Pressure Sender / Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 International LT?
Our catalog currently lists 4 electrical switch & relay parts for the 2021 International LT across 2 subcategories and 3 brands, covering both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2021 International LT engines?
Some do. 1 part fits every engine; the other 3 are engine-specific. Each row (and the filter at the top) shows which. 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 2021 International LT?
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 2021 International LT 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 2021 International LT?
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 2021 International LT
Electrical Switch & Relay Parts for Other International LT Years
Switch vehicle or jump to a subcategory
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.