38 Electrical switch & relay parts are listed for the 1978 Saab 99, in 10 part types, covering both the 2.0L L4 and the 2.0L L4 Turbocharged. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 1978 Saab 99, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 23 parts of the 38 listed are Oil Pressure Sender / Switch (11 parts), Brake Light Switch (6 parts) and Neutral Safety Switch / Range Sensor Relay (6 parts). The other 7 part types cover the remaining 15 parts.
The 1978 Saab 99 was sold with both the 2.0L L4 and the 2.0L L4 Turbocharged. All 38 parts on this page fit every engine.
The most listed brands for 1978 Saab 99 electrical switch & relay parts are STANDARD MOTOR PRODUCTS (13 parts), WELLS (5 parts) and HELLA (5 parts), plus 7 more brands. Quality grades include Standard Replacement and Economy.
7 parts on this 1978 Saab 99 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including STANDARD MOTOR PRODUCTS SLS66 (Brake Light Switch) and STANDARD MOTOR PRODUCTS RY116 (Neutral Safety Switch / Range Sensor Relay). Click any part number to see every vehicle that part fits.
Back Up / Reverse Lamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 1978 99 engines | LS244 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Back Up / Reverse Lamp 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.
This group shows a single part: STANDARD MOTOR PRODUCTS LS244.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKP Fits: all 1978 99 engines | SKSLS66 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: all 1978 99 engines | SLS66T | 🇺🇸 US 🇨🇦 CA | T-SeriesFunctions: Switch | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: all 1978 99 engines | SLS66 | 🇺🇸 US 🇨🇦 CA | Functions: Switch | View on Amazon |
| WELLS Popular Fits: all 1978 99 engines | 1S5238 | 🇺🇸 US 🇨🇦 CA | Mounting Hardware Included: No | View on Amazon |
| HELLA Fits: all 1978 99 engines | 004846001 | 🇺🇸 US 🇨🇦 CA | 2-Pin ConnectorBolted | View on Amazon |
| ROSTRA Fits: all 1978 99 engines | 620014 | 🇺🇸 US 🇨🇦 CA | Connector Gender: Male | 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.
6 Brake Light Switch parts for the 1978 Saab 99 come from 5 brands — STANDARD MOTOR PRODUCTS, SKP, WELLS and 2 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS SLS66. Every part fits both the 2.0L L4 and the 2.0L L4 Turbocharged.
The Economy section lists 2 options from SKP and STANDARD MOTOR PRODUCTS — the catalog's value-priced group. SKP SKSLS66 is listed in this group.
In the Standard Replacement grade, STANDARD MOTOR PRODUCTS, WELLS, HELLA and 1 other brand supply 4 parts: built to original-equipment specification. A representative part number is STANDARD MOTOR PRODUCTS SLS66.
This group includes STANDARD MOTOR PRODUCTS SLS66, SKP SKSLS66 and STANDARD MOTOR PRODUCTS SLS66T and the remaining parts above.
Fuel Pump Cutoff Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: all 1978 99 engines | D1876D | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 1978 99 engines | FV7 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Fuel Pump Cutoff 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.
2 Fuel Pump Cutoff Switch parts for the 1978 Saab 99 come from 2 brands — ACDELCO and STANDARD MOTOR PRODUCTS. Every part fits both the 2.0L L4 and the 2.0L L4 Turbocharged.
This group includes ACDELCO D1876D and STANDARD MOTOR PRODUCTS FV7.
Headlamp Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 1978 99 engines | HP3810 | 🇺🇸 US 🇨🇦 CA | HandypackConnector Shape: Polygon | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 1978 99 engines | S654 | 🇺🇸 US 🇨🇦 CA | Connector Shape: PolygonLength (In): 1 | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: all 1978 99 engines | CON123 | 🇺🇸 US 🇨🇦 CA | Terminal Gender: FemaleTerminal Type: Spade | View on Amazon |
This table covers the relays that control the Headlamp 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.
3 Headlamp Relay parts for the 1978 Saab 99 come from 2 brands — STANDARD MOTOR PRODUCTS and UNITED MOTOR PRODUCTS. Every part fits both the 2.0L L4 and the 2.0L L4 Turbocharged.
This group includes STANDARD MOTOR PRODUCTS HP3810, STANDARD MOTOR PRODUCTS S654 and UNITED MOTOR PRODUCTS CON123.
Multi-Function Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 1978 99 engines | 1R1061 | 🇺🇸 US 🇨🇦 CA | Amperage Rating: 40 AConnector Gender: Male | View on Amazon |
This table covers the relays that control the Multi-Function 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: WELLS 1R1061.
Neutral Safety Switch / Range Sensor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: all 1978 99 engines | RY116 | 🇺🇸 US 🇨🇦 CA | Connector Quantity: 1Mounting Bracket Included: No | View on Amazon |
| WELLS Popular Fits: all 1978 99 engines | 1R1061 | 🇺🇸 US 🇨🇦 CA | Amperage Rating: 40 AConnector Gender: Male | View on Amazon |
| ROSTRA Fits: all 1978 99 engines | 600003 | 🇺🇸 US 🇨🇦 CA | Amperage Rating: 40 AmpereConnector Gender: Male | View on Amazon |
| ROSTRA Fits: all 1978 99 engines | 600034 | 🇺🇸 US 🇨🇦 CA | Connector Gender: MaleMounting Bracket Included: YES | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 1978 99 engines | RY116T | 🇺🇸 US 🇨🇦 CA | T-SeriesConnector Shape: Square | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 1978 99 engines | RY30T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
This table covers the relays that control the Neutral Safety Switch / Range Sensor 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.
6 Neutral Safety Switch / Range Sensor Relay parts are listed for the 1978 Saab 99, from STANDARD MOTOR PRODUCTS, ROSTRA and WELLS. STANDARD MOTOR PRODUCTS RY116 carries the "Popular" badge. All of them fit every engine offered in the 1978 99.
Listed part numbers: STANDARD MOTOR PRODUCTS RY116, WELLS 1R1061 and ROSTRA 600003, plus the other parts above.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: all 1978 99 engines | PS12T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
| HOLSTEIN Fits: all 1978 99 engines | 2OPS0073 | 🇺🇸 US 🇨🇦 CA | with Light | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 1978 99 engines | PS15T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: all 1978 99 engines | OPS4 | 🇺🇸 US 🇨🇦 CA | with Light | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular Fits: all 1978 99 engines | D8050 | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular Fits: all 1978 99 engines | PS12 | 🇺🇸 US 🇨🇦 CA | with Gauge | View on Amazon |
| ACDELCO Fits: all 1978 99 engines | C8020 | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| BECK/ARNLEY Fits: all 1978 99 engines | 2010023 | 🇺🇸 US 🇨🇦 CA | Contains Light | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 1978 99 engines | PS15 | 🇺🇸 US 🇨🇦 CA | Finish: Brass | View on Amazon |
| WELLS Fits: all 1978 99 engines | 1S6649 | 🇺🇸 US 🇨🇦 CA | with Light | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT Fits: all 1978 99 engines | OS3537 | 🇺🇸 US 🇨🇦 CA | Combi Switch Function: Normally Closed | 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.
11 Oil Pressure Sender / Switch parts for the 1978 Saab 99 come from 7 brands — STANDARD MOTOR PRODUCTS, ACDELCO, HOLSTEIN and 4 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS PS12T. Every part fits both the 2.0L L4 and the 2.0L L4 Turbocharged.
The Economy section: 4 options from STANDARD MOTOR PRODUCTS, HOLSTEIN and UNITED MOTOR PRODUCTS. STANDARD MOTOR PRODUCTS PS12T is listed in this group.
Standard Replacement: 6 parts, from ACDELCO, STANDARD MOTOR PRODUCTS, BECK/ARNLEY and 1 other brand. A representative part number is ACDELCO D8050.
1 further part sits outside the graded sections, with the same engine-level match.
Radiator Fan Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: all 1978 99 engines | 2011545 | 🇺🇸 US 🇨🇦 CA | 2 Prong Switch 82C Degrees, Warmer Climates | View on Amazon |
| BECK/ARNLEY Fits: all 1978 99 engines | 2010809 | 🇺🇸 US 🇨🇦 CA | 2 Prong Switch 92C Degrees, Standard Climates | View on Amazon |
| ROSTRA Fits: all 1978 99 engines | 750025 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: all 1978 99 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 1978 Saab 99 come from 3 brands — BECK/ARNLEY, ROSTRA and WELLS. Every part fits both the 2.0L L4 and the 2.0L L4 Turbocharged.
Listed part numbers: BECK/ARNLEY 2011545, BECK/ARNLEY 2010809 and ROSTRA 750025, plus the other parts above.
Wiper Motor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: all 1978 99 engines | 933332541 | 🇺🇸 US 🇨🇦 CA | 4-Pin ConnectorPlug: B | View on Amazon |
| HELLA Fits: all 1978 99 engines | 933332641 | 🇺🇸 US 🇨🇦 CA | 5-Pin ConnectorColor: Black, Gray | View on Amazon |
This table covers the relays that control the Wiper Motor 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.
2 Wiper Motor Relay parts for the 1978 Saab 99 come from HELLA. Every part fits both the 2.0L L4 and the 2.0L L4 Turbocharged.
This group includes HELLA 933332541 and HELLA 933332641.
Wiring Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: all 1978 99 engines | 933332541 | 🇺🇸 US 🇨🇦 CA | 4-Pin ConnectorPlug: B | View on Amazon |
| HELLA Fits: all 1978 99 engines | 933332641 | 🇺🇸 US 🇨🇦 CA | 5-Pin ConnectorColor: Black, Gray | View on Amazon |
This table covers the relays that control the Wiring 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.
2 Wiring Relay parts for the 1978 Saab 99 come from HELLA. Every part fits both the 2.0L L4 and the 2.0L L4 Turbocharged.
This group includes HELLA 933332541 and HELLA 933332641.
Buying Electrical Switch & Relay Parts for a 1978 Saab 99
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- You do not need to pick an engine: every electrical switch & relay part on this page fits both the 2.0L L4 and the 2.0L L4 Turbocharged.
- 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 1978 Saab 99?
Our catalog currently lists 38 electrical switch & relay parts for the 1978 Saab 99 across 10 subcategories and 10 brands, covering both the 2.0L L4 and the 2.0L L4 Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 1978 Saab 99 engines?
No. On this page every electrical switch & relay part fits both the 2.0L L4 and the 2.0L L4 Turbocharged. You do not need to pick an engine to choose the right row — use the notes for position and trim.
What are the signs of electrical switch & relay problems on a 1978 Saab 99?
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 1978 Saab 99 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 1978 Saab 99?
Every part on this page already fits both the 2.0L L4 and the 2.0L L4 Turbocharged. 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 1978 Saab 99
Electrical Switch & Relay Parts for Other Saab 99 Years
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