This page lists 16 electrical switch & relay parts for the 1981 Fiat 124, across 3 part types, covering the 2.0L L4 engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 1981 Fiat 124, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. All 16 listed parts are Oil Pressure Sender / Switch (8 parts), Brake Light Switch (5 parts) and Radiator Fan Switch (3 parts).
Every part on this page is matched to the 2.0L L4 — the only engine offered in the 1981 Fiat 124.
The most listed brands for 1981 Fiat 124 electrical switch & relay parts are STANDARD MOTOR PRODUCTS (4 parts), BECK/ARNLEY (3 parts) and WELLS (2 parts), plus 7 more brands. Quality grades include Standard Replacement and Economy.
3 parts on this 1981 Fiat 124 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including STANDARD MOTOR PRODUCTS SLS125 (Brake Light Switch) and BECK/ARNLEY 2010353 (Oil Pressure Sender / Switch). Click any part number to see every vehicle that part fits.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ULTRA-POWER | 1S5756 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular | SLS125 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| BECK/ARNLEY | 2010338 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| FACET | 71000 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS | 1S5756 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the pedal-mounted switch that turns on the brake lamps. 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.
5 Brake Light Switch parts for the 1981 Fiat 124 come from 5 brands — ULTRA-POWER, STANDARD MOTOR PRODUCTS, BECK/ARNLEY and 2 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS SLS125.
The Economy section lists 1 option from ULTRA-POWER — the catalog's value-priced group. ULTRA-POWER 1S5756 is listed in this group.
In the Standard Replacement grade, STANDARD MOTOR PRODUCTS, BECK/ARNLEY, FACET and 1 other brand supply 4 parts: built to original-equipment specification. A representative part number is STANDARD MOTOR PRODUCTS SLS125.
This group includes STANDARD MOTOR PRODUCTS SLS125, ULTRA-POWER 1S5756 and BECK/ARNLEY 2010338 and the remaining parts above.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN | 2OPS0134 | 🇺🇸 US 🇨🇦 CA | with Light | View on Amazon |
| UNITED MOTOR PRODUCTS | OPS27 | 🇺🇸 US 🇨🇦 CA | with Light | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Popular | 2010353 | 🇺🇸 US 🇨🇦 CA | with Light | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular | PS159 | 🇺🇸 US 🇨🇦 CA | with Light | View on Amazon |
| GPD | 1815401 | 🇺🇸 US 🇨🇦 CA | with Light | View on Amazon |
| ROSTRA | 501397 | 🇺🇸 US 🇨🇦 CA | with Light | View on Amazon |
| STANDARD MOTOR PRODUCTS | PS359 | 🇺🇸 US 🇨🇦 CA | with Gauge | View on Amazon |
| WELLS | 1S6565 | 🇺🇸 US 🇨🇦 CA | with Light | 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.
8 Oil Pressure Sender / Switch parts for the 1981 Fiat 124 come from 7 brands — STANDARD MOTOR PRODUCTS, HOLSTEIN, UNITED MOTOR PRODUCTS and 4 other brands. The "Popular" part is BECK/ARNLEY 2010353.
The Economy section: 2 options from HOLSTEIN and UNITED MOTOR PRODUCTS. HOLSTEIN 2OPS0134 is listed in this group.
Standard Replacement: 6 parts, from STANDARD MOTOR PRODUCTS, BECK/ARNLEY, GPD and 2 other brands. A representative part number is BECK/ARNLEY 2010353.
Listed part numbers: BECK/ARNLEY 2010353, HOLSTEIN 2OPS0134 and UNITED MOTOR PRODUCTS OPS27, plus the other parts above.
Radiator Fan Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY | 2011321 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| FOUR SEASONS | 37373 | 🇺🇸 US 🇨🇦 CA | Temperature Switch | View on Amazon |
| STANDARD MOTOR PRODUCTS | TS100 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Radiator Fan 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 Radiator Fan Switch parts for the 1981 Fiat 124 come from 3 brands — BECK/ARNLEY, FOUR SEASONS and STANDARD MOTOR PRODUCTS.
Listed part numbers: BECK/ARNLEY 2011321, FOUR SEASONS 37373 and STANDARD MOTOR PRODUCTS TS100.
Buying Electrical Switch & Relay Parts for a 1981 Fiat 124
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Confirm you have the 2.0L L4 engine — every part on this page is matched to it.
- 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: Oil Pressure Sender / Switch and Brake Light Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 1981 Fiat 124?
Our catalog currently lists 16 electrical switch & relay parts for the 1981 Fiat 124 across 3 subcategories and 10 brands, covering the 2.0L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 1981 Fiat 124?
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 1981 Fiat 124 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 1981 Fiat 124?
Every part on this page is matched to the 2.0L L4 engine. 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 1981 Fiat 124
Electrical Switch & Relay Parts for Other Fiat 124 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.