Aftermarket Trim Sender Sensor for OMC Cobra and Volvo Penta Stern Drives – Replaces 3850470, 984748, 0984748
Aftermarket Trim Sender Sensor for OMC Cobra and Volvo Penta Stern Drives – Replaces 3850470, 984748, 0984748 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Aftermarket Trim Sender Sensor for OMC Cobra and Volvo Penta Stern ...
Aftermarket Trim Sender Sensor for OMC Cobra and Volvo Penta Stern Drives – Replaces 3850470, 984748, 0984748 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket trim sender sensor is designed for OMC Cobra stern-drive applications and is also listed for Volvo Penta stern-drive applications. It monitors sterndrive trim position so the boat's trim gauge can display the drive angle.
The primary replacement references listed for this sensor are 3850470, 984748, and 0984748. Sierra Marine reference 18-7634 is also associated with the OMC Cobra trim sender application and replaces OMC reference 984748.
- Trim position sensor for stern-drive systems.
- Designed as an aftermarket replacement for the listed reference numbers.
- Suitable for OMC Cobra and Volvo Penta stern-drive applications as listed.
- Verify the reference number and physical configuration before ordering.
Part Number Matrix
Use the following references to compare your existing sensor with this replacement. Reference numbers may vary by drive configuration and model year.
| Brand or Reference | Part Number | Reference Type |
|---|---|---|
| OMC | 3850470 | OEM reference |
| OMC | 984748 | OEM reference |
| Volvo Penta | 0984748 | OEM reference listed by the supplier |
| Sierra Marine | 18-7634 | Aftermarket reference; replaces 984748 |
| Additional catalog references | 0983939, 0984731 | Reference numbers associated with the Cobra trim sensor application in aftermarket catalog data |
Engine and Model Compatibility
The supplier lists this sensor for OMC Cobra and Volvo Penta stern-drive applications. A catalog listing associates reference 3850470 with Cobra applications from approximately 1987–1993; use the part-number match as the primary fitment check because exact coverage can vary by drive configuration.
| Brand | Drive or Application | Catalog Year Range | Associated References |
|---|---|---|---|
| OMC | Cobra stern drive | 1987–1993 catalog application | 3850470, 984748, 18-7634 |
| Volvo Penta | Stern drive | Verify by reference number | 0984748; additional catalog references include 0983939 and 0984731 |
Important: Do not rely on engine displacement, brand, or year alone. Compare the number on your original sender and confirm the mounting arrangement and connector before installation.
Technical Specifications
- Product Type
- Trim sender sensor
- Application
- OMC Cobra and Volvo Penta stern-drive applications
- Product Construction
- Aftermarket replacement component
- Primary Replacement References
- 3850470, 984748, 0984748
- Aftermarket Reference
- Sierra Marine 18-7634
- Catalog Application
- OMC Cobra, approximately 1987–1993 in the referenced catalog data
What's in the Box
- 1 x Trim sender sensor
This is a single replacement sensor, not a kit. Mounting hardware, wiring, gauges, and other sterndrive components are not included unless specifically supplied with the order.
Installation Notes
- Switch off the engine and disconnect the boat battery before beginning electrical work.
- Locate the existing trim sender on the sterndrive and compare its shape, mounting position, and reference number with the replacement.
- Label or photograph the existing wiring before disconnecting it.
- Disconnect the old sender carefully and remove its retaining hardware.
- Clean the mounting area and inspect the surrounding wiring and terminals for corrosion or damage.
- Position the replacement sensor in the same orientation as the original and secure it with suitable original hardware where applicable.
- Reconnect the wiring, restore battery power, and test the trim gauge with the drive movement.
- If the gauge reading is reversed, inaccurate, or does not respond, switch off the battery and recheck the wiring, orientation, and reference-number match.
Follow the installation instructions for your specific sterndrive. If the original mounting hardware or wiring is damaged, professional marine service is recommended.
Troubleshooting and FAQ
What does a trim sender sensor do?
The trim sender detects the sterndrive's trim position and transmits that position to the boat's trim gauge.
What are common symptoms of a failed trim sender?
Common symptoms include an erratic gauge, a gauge that remains at one position, a gauge that does not respond when the drive moves, or a reading that does not match the actual sterndrive position.
Will this fit every OMC Cobra or Volvo Penta drive?
No universal fitment should be assumed. The supplier lists the product for OMC Cobra and Volvo Penta stern-drive applications, while catalog data associates the 3850470 reference with Cobra applications from approximately 1987–1993. Confirm the existing reference number and physical configuration before ordering.
Does the package include a wiring harness or trim gauge?
No. The package contains one trim sender sensor. A wiring harness, trim gauge, mounting hardware, and other components are not included unless specifically stated with the order.
Does the sensor require calibration?
After installation, check the gauge at the full-up and full-down drive positions. If the reading is inaccurate, inspect the sensor orientation, wiring, mounting, and part-number match before operating the boat.
Is this an OEM component?
This listing is for an aftermarket replacement sensor. OMC and Volvo Penta numbers shown on this page are reference numbers used for identification and compatibility comparison; the replacement itself is not represented as an OEM-manufactured component.
How can I avoid ordering the wrong sensor?
Match the number on your existing sender to the references listed above and compare the mounting arrangement and connector. If the original component differs, verify compatibility before purchase.
Safety and Important Information
- Disconnect the battery before handling the sensor wiring.
- Confirm the reference number, mounting arrangement, and connector before installation.
- Do not operate the boat if the trim gauge gives an unsafe or clearly incorrect reading.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended when the sterndrive or wiring is corroded, damaged, or difficult to access.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for common marine repair applications.
- Reference-Based Fitment — Product references are provided to help customers compare replacement parts with their original components.
- Support for Your Repair — Verify the application and part number before installation for the best result.
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