16 Electrical switch & relay parts are listed for the 2012 International Workstar, in 9 part types, covering all 6 engine options (10.5L L6 DIESEL Turbocharged, 10.8L L6 DIESEL Turbocharged, 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL and more). Each one has a brand, a manufacturer part number and notes that say where it fits.
The switch and relay system on the 2012 International Workstar covers the switches, relays and flashers that route power to everything the driver touches. The largest groups are A/C Refrigerant Pressure Switch (3 parts), Blower Switch (3 parts) and Air Brake Pressure Switch (2 parts). The other 6 part types cover the remaining 8 parts.
The 2012 International Workstar was sold with 6 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2012 International Workstar electrical switch & relay parts are DORMAN (9 parts), UAC (4 parts) and WELLS (2 parts), plus 1 more brand. Quality grades include Economy and Standard Replacement.
Each part number listed for the 2012 International Workstar opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9047790 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| UAC Fits: 7.6L L6 DIESEL | SW11423C | 🇺🇸 US 🇨🇦 CA | Low Pressure Switch | View on Amazon |
| UAC Fits: 7.6L L6 DIESEL | SW11422C | 🇺🇸 US 🇨🇦 CA | Low 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.
3 A/C Refrigerant Pressure Switch parts for the 2012 International Workstar come from 2 brands — UAC and DORMAN.
Listed part numbers: DORMAN 9047790, UAC SW11423C and UAC SW11422C.
A/C System Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: 10.5L L6 DIESEL Turbocharged, 10.8L L6 DIESEL Turbocharged, 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | RE8434C | 🇺🇸 US 🇨🇦 CA | 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.
This group shows a single part: UAC RE8434C.
Air Brake Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9016001 | 🇺🇸 US 🇨🇦 CA | 7400 | View on Amazon |
| DORMAN Fits: 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9047791 | 🇺🇸 US 🇨🇦 CA | DashboardAt Dash Valve | View on Amazon |
This table covers the Air Brake Pressure 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.
DORMAN supplies both parts for the 2012 International Workstar.
Listed part numbers: DORMAN 9016001 and DORMAN 9047791.
Blower Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: 10.5L L6 DIESEL Turbocharged, 10.8L L6 DIESEL Turbocharged, 7.6L L6 DIESEL | SW1000C | 🇺🇸 US 🇨🇦 CA | Blower Switch Rotary | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 10.5L L6 DIESEL Turbocharged, 10.8L L6 DIESEL Turbocharged, 7.6L L6 DIESEL | 1S15851 | 🇺🇸 US 🇨🇦 CA | Work Star 7600 | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 1S15851 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Blower 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 Blower Switch parts for the 2012 International Workstar come from 2 brands — WELLS and UAC.
The Economy section lists 1 option from UAC — the catalog's value-priced group. UAC SW1000C is listed in this group.
In the Standard Replacement grade, WELLS supplies 1 part: built to original-equipment specification. A representative part number is WELLS 1S15851.
1 further part sits outside the graded sections, with the same engine-level match.
Part numbers include UAC SW1000C and WELLS 1S15851, among others listed above.
Clutch Pedal Position / Starter Safety Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 10.5L L6 DIESEL Turbocharged, 10.8L L6 DIESEL Turbocharged, 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9015103 | 🇺🇸 US 🇨🇦 CA | Work Star 7600 | View on Amazon |
This table covers the Clutch Pedal Position / Starter Safety 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.
One part is listed for the 2012 International Workstar — DORMAN 9015103.
Cruise Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 10.5L L6 DIESEL Turbocharged, 10.8L L6 DIESEL Turbocharged, 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9010008 | 🇺🇸 US 🇨🇦 CA | Left | View on Amazon |
| DORMAN Fits: 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9015129 | 🇺🇸 US 🇨🇦 CA | Right | View on Amazon |
This table covers the Cruise Control 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.
DORMAN supplies both parts for the 2012 International Workstar.
Part numbers include DORMAN 9010008 and DORMAN 9015129.
HVAC Control Switch / Panel
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE Fits: 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | ASW48000P | 🇺🇸 US 🇨🇦 CA | Heavy Duty AC | View on Amazon |
This table covers the HVAC Control Switch panels.
One part is listed for the 2012 International Workstar — MAHLE / CLEVITE ASW48000P.
Outside Mirror Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 10.5L L6 DIESEL Turbocharged, 10.8L L6 DIESEL Turbocharged, 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9015126 | 🇺🇸 US 🇨🇦 CA | Front Left | View on Amazon |
This table covers the Outside Mirror 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.
One part is listed for the 2012 International Workstar — DORMAN 9015126.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9015105 | 🇺🇸 US 🇨🇦 CA | Front Right | View on Amazon |
| DORMAN Fits: 7.6L L6 DIESEL, 8.7L L6 DIESEL Turbocharged, 9.3L L6 DIESEL Turbocharged | 9015104 | 🇺🇸 US 🇨🇦 CA | Front Left | View on Amazon |
This table covers the switches that command each window motor. 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.
2 Power Window Switch parts for the 2012 International Workstar come from DORMAN.
Part numbers include DORMAN 9015105 and DORMAN 9015104.
Buying Electrical Switch & Relay Parts for a 2012 International Workstar
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 Refrigerant Pressure Switch and Blower Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2012 International Workstar?
Our catalog currently lists 16 electrical switch & relay parts for the 2012 International Workstar across 9 subcategories and 4 brands, covering all 6 engine options (10.5L L6 DIESEL Turbocharged, 10.8L L6 DIESEL Turbocharged, 12.4L L6 DIESEL Turbocharged, 7.6L L6 DIESEL and more). Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2012 International Workstar 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 International Workstar?
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 International Workstar 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 International Workstar?
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 International Workstar
Electrical Switch & Relay Parts for Other International Workstar Years
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