The 1991 Ferrari Testarossa has 16 electrical connector parts with verified fitment on this page — 7 part types and 5 brands, covering the 4.9L H12 engine. Each part includes a manufacturer part number and application notes.
The connector system on the 1991 Ferrari Testarossa supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. The largest groups are Idle Air Control (IAC) Valve Connector (5 parts), Throttle Position Sensor (TPS) Connector (4 parts) and Temperature Sender / Sensor Connector (3 parts). The other 4 part types cover the remaining 4 parts.
The 1991 Ferrari Testarossa came with a single engine, the 4.9L H12, and every part is verified against it.
5 brands supply electrical connector parts for the 1991 Ferrari Testarossa, led by WELLS (5 parts), UNITED MOTOR PRODUCTS (4 parts) and STANDARD MOTOR PRODUCTS (4 parts), plus 2 more brands.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1991 Ferrari Testarossa. 1 part has it: WELLS 1P1421 (Idle Air Control (IAC) Valve Connector). Each part number opens a page with every vehicle that part fits.
Cold Start Valve Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1P1347 | 🇺🇸 US 🇨🇦 CA | Wire Gauge Measurement: 18 | View on Amazon |
This table covers the harness connectors at the Cold Start Valve. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: WELLS 1P1347.
Cold Start Valve Temperature Switch Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1P1347 | 🇺🇸 US 🇨🇦 CA | Wire Gauge Measurement: 18 | View on Amazon |
This table covers the harness connectors at the Cold Start Valve Temperature Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: WELLS 1P1347.
Distributor Pickup Coil Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UNITED MOTOR PRODUCTS | CON201 | 🇺🇸 US 🇨🇦 CA | with Quick Release Clip | View on Amazon |
This table covers the harness connectors at the Distributor Pickup Coil. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: UNITED MOTOR PRODUCTS CON201.
Idle Air Control (IAC) Valve Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Popular | 1P1421 | 🇺🇸 US 🇨🇦 CA | Wiring Harness Length: 9.43 In | View on Amazon |
| ROSTRA | 610105 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS | HP3975 | 🇺🇸 US 🇨🇦 CA | Handy PackBlack | View on Amazon |
| STANDARD MOTOR PRODUCTS | S745 | 🇺🇸 US 🇨🇦 CA | Connector Shape: Rectangleblack | View on Amazon |
| UNITED MOTOR PRODUCTS | CON149 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Idle Air Control (IAC) Valve. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
5 Idle Air Control (IAC) Valve Connector parts are listed for the 1991 Ferrari Testarossa, from STANDARD MOTOR PRODUCTS, WELLS, ROSTRA and 1 other brand. WELLS 1P1421 carries the "Popular" badge.
Listed part numbers: WELLS 1P1421, ROSTRA 610105 and STANDARD MOTOR PRODUCTS HP3975, plus the other parts above.
Oil Temperature Switch Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UNITED MOTOR PRODUCTS | CON201 | 🇺🇸 US 🇨🇦 CA | with Quick Release Clip | View on Amazon |
This table covers the harness connectors at the Oil Temperature Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: UNITED MOTOR PRODUCTS CON201.
Temperature Sender / Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS | 70005 | 🇺🇸 US 🇨🇦 CA | 2 Terminal FemaleFull Skirt | View on Amazon |
| FOUR SEASONS | 70017 | 🇺🇸 US 🇨🇦 CA | 2 Terminal FemaleHalf Skirt | View on Amazon |
| WELLS | 1P1347 | 🇺🇸 US 🇨🇦 CA | Wire Gauge Measurement: 18 | View on Amazon |
This table covers the harness connectors at the Temperature Sender / Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
3 Temperature Sender / Sensor Connector parts for the 1991 Ferrari Testarossa come from 2 brands — FOUR SEASONS and WELLS.
Listed part numbers: FOUR SEASONS 70005, FOUR SEASONS 70017 and WELLS 1P1347.
Throttle Position Sensor (TPS) Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | HP3975 | 🇺🇸 US 🇨🇦 CA | Handy PackBlack | View on Amazon |
| STANDARD MOTOR PRODUCTS | S745 | 🇺🇸 US 🇨🇦 CA | Connector Shape: Rectangleblack | View on Amazon |
| UNITED MOTOR PRODUCTS | CON149 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS | 1P1421 | 🇺🇸 US 🇨🇦 CA | Wiring Harness Length: 9.43 In | View on Amazon |
This table covers the harness connectors at the Throttle Position Sensor (TPS). Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
4 Throttle Position Sensor (TPS) Connector parts are listed for the 1991 Ferrari Testarossa, from STANDARD MOTOR PRODUCTS, UNITED MOTOR PRODUCTS and WELLS.
Listed part numbers: STANDARD MOTOR PRODUCTS HP3975, STANDARD MOTOR PRODUCTS S745 and UNITED MOTOR PRODUCTS CON149, plus the other parts above.
Buying Electrical Connector Parts for a 1991 Ferrari Testarossa
On this vehicle, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules.
- Confirm you have the 4.9L H12 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, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Idle Air Control (IAC) Valve Connector and Throttle Position Sensor (TPS) Connector .
Frequently Asked Questions
How many electrical connector parts fit the 1991 Ferrari Testarossa?
Our catalog currently lists 16 electrical connector parts for the 1991 Ferrari Testarossa across 7 subcategories and 5 brands, covering the 4.9L H12 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical connector problems on a 1991 Ferrari Testarossa?
Common symptoms include intermittent faults that move when the harness is wiggled, green corrosion inside a plug, or melted connector housings near heat sources. 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, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
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 1991 Ferrari Testarossa 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 1991 Ferrari Testarossa?
Every part on this page is matched to the 4.9L H12 engine. Then match the connector by terminal count and keyway, not just appearance — many families look identical but will not lock. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1991 Ferrari Testarossa
Electrical Connector Parts for Other Ferrari Testarossa 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.