This page lists 12 electrical switch & relay parts for the 1972 Fiat 128, across 3 part types, covering both the 1.1L L4 and the 1.3L L4. Every part shows its brand, manufacturer part number and fitment notes.
On the 1972 Fiat 128, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. All 12 listed parts are Brake Light Switch (5 parts), Radiator Fan Switch (4 parts) and Oil Pressure Sender / Switch (3 parts).
The 1972 Fiat 128 was sold with both the 1.1L L4 and the 1.3L L4. 11 parts fit every engine; the other 1 is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 1972 Fiat 128 electrical switch & relay parts are STANDARD MOTOR PRODUCTS (3 parts), WELLS (3 parts) and BECK/ARNLEY (2 parts), plus 3 more brands. Quality grades include Standard Replacement and Economy.
1 part on this 1972 Fiat 128 page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — STANDARD MOTOR PRODUCTS SLS125 (Brake Light Switch). Click any part number to see every vehicle that part fits.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ULTRA-POWER Fits: all 1972 128 engines | 1S5756 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: all 1972 128 engines | SLS125 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| BECK/ARNLEY Fits: all 1972 128 engines | 2010338 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| FACET Fits: all 1972 128 engines | 71000 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: all 1972 128 engines | 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 1972 Fiat 128 come from 5 brands — ULTRA-POWER, STANDARD MOTOR PRODUCTS, BECK/ARNLEY and 2 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS SLS125. Every part fits both the 1.1L L4 and the 1.3L L4.
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
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA Fits: all 1972 128 engines | 501397 | 🇺🇸 US 🇨🇦 CA | with Light | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 1972 128 engines | PS187 | 🇺🇸 US 🇨🇦 CA | with Gauge | View on Amazon |
| WELLS Fits: all 1972 128 engines | 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.
3 Oil Pressure Sender / Switch parts for the 1972 Fiat 128 come from 3 brands — ROSTRA, STANDARD MOTOR PRODUCTS and WELLS. Every part fits both the 1.1L L4 and the 1.3L L4.
Part numbers include ROSTRA 501397, STANDARD MOTOR PRODUCTS PS187 and WELLS 1S6565.
Radiator Fan Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: 1.1L L4 | 2011321 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ROSTRA Fits: all 1972 128 engines | 750025 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: all 1972 128 engines | TS108 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: all 1972 128 engines | 1S4391 | 🇺🇸 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.
4 Radiator Fan Switch parts for the 1972 Fiat 128 come from 4 brands — BECK/ARNLEY, ROSTRA, STANDARD MOTOR PRODUCTS and 1 other brand. 3 parts fit every engine; the other 1 is engine-specific.
This group includes BECK/ARNLEY 2011321, ROSTRA 750025 and STANDARD MOTOR PRODUCTS TS108 and the remaining parts above.
Buying Electrical Switch & Relay Parts for a 1972 Fiat 128
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: Brake Light Switch and Radiator Fan Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 1972 Fiat 128?
Our catalog currently lists 12 electrical switch & relay parts for the 1972 Fiat 128 across 3 subcategories and 6 brands, covering both the 1.1L L4 and the 1.3L L4. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 1972 Fiat 128 engines?
Some do. 11 parts fit every engine; the other 1 is 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 1972 Fiat 128?
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 1972 Fiat 128 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 1972 Fiat 128?
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 1972 Fiat 128
Electrical Switch & Relay Parts for Other Fiat 128 Years
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