Power Trim Sender Kit – Fits MerCruiser MC-I, R, MR, Alpha One, Alpha One Gen II and Bravo Sterndrives (Replaces 805320A03)
Power Trim Sender Kit – Fits MerCruiser MC-I, R, MR, Alpha One, Alpha One Gen II and Bravo Sterndrives (Replaces 805320A03) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Power Trim Sender Kit – Fits MerCruiser MC-I, R, MR, Alpha One, Alp...
Product Details
This is a complete Power Trim Sender Kit for MerCruiser stern drives, providing accurate trim and tilt position feedback to your helm gauge. It is designed for a wide range of MerCruiser units, including MC-I, R, MR, Alpha One, Alpha One Gen II, and Bravo models. The kit includes the trim sender, trim limit switch, and necessary wire leads for a comprehensive replacement.
It serves as a direct interchange for Mercury/MerCruiser part numbers 805320A03, 805320A1, 96863A15, and 17693A2, as well as Sierra 18-7633.
- Mounts directly on the stern drive assembly.
- Connects via pre-attached wire leads with crimp connectors.
- Includes both the primary trim position sender and the upper limit switch.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 805320A03 |
| Mercury/MerCruiser | 805320A1 |
| Mercury/MerCruiser | 96863A15 |
| Mercury/MerCruiser | 17693A2 |
| Sierra | 18-7633 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is compatible with the following MerCruiser Sterndrive series.
| Brand | Model | OEM Part No. |
|---|---|---|
| MerCruiser | MC-I | 805320A03 |
| MerCruiser | R | 805320A03 |
| MerCruiser | MR | 805320A03 |
| MerCruiser | Alpha One | 805320A03 |
| MerCruiser | Alpha One Gen II | 805320A03 |
| MerCruiser | Bravo | 805320A03 |
Technical Specs
- Product Type
- Power Trim Sender Kit
- Installation
- Stern Drive Mounted
- Connection
- Wire Leads with Crimp Connectors
- Components
- Trim Sender, Trim Limit Switch, Wire Leads
- Switch Type
- Limit Switch
- Contact Type
- Normally Closed
- Terminal Type
- Screw
- Mounting Type
- Surface Mount
- Contact Material
- Stainless Steel
- Actuator Type
- Limit Switch
- Number of Positions
- 2
- Circuit Type
- 1-way
- Weight
- 0.90 lb (0.41 kg)
- Dimensions
- Length: 14.0 in, Width: 9.0 in, Height: 7.5 in
What’s in the Box
- 1 x Trim Limit Switch
- 1 x Trim Sender Switch
- 2 x Wire Leads
Installation Notes
- Disconnect the boat's battery to prevent electrical shorts.
- Raise the sterndrive to the full "UP" or "TRAILER" position and secure it.
- Locate and disconnect the old trim sender and limit switch wiring.
- Remove the mounting screws holding the old switches to the gimbal housing.
- Clean the mounting surfaces to ensure a good seal.
- Install the new trim sender and limit switch, ensuring they are oriented correctly.
- Route and connect the new wiring harnesses according to the manufacturer's diagram.
- Set the maximum trim extension according to your model: 21-3/4 in for R/MR/Alpha One/Bravo models, or 20-3/4 in for Alpha One Gen II models.
- Reconnect the battery and test the trim gauge and limit switch functionality.
Troubleshooting & FAQ
How do I know if my trim sender is failing?
Common signs include an erratic or non-functional trim gauge on your dashboard, the gauge showing the drive is fully up or down regardless of its actual position, or intermittent functionality.
What is the difference between the trim sender and the trim limit switch?
The trim sender (port side) is a variable resistor that sends the drive's position to your gauge. The trim limit switch (starboard side) is a safety feature that stops the "TRIM" button from raising the drive too high during operation, preventing potential damage.
Can I just replace the sender or the limit switch individually?
Yes, but it is often recommended to replace both simultaneously, especially on older vessels. Both components are exposed to the same harsh marine environment and tend to have similar service lives. This kit includes both for a complete overhaul.
Is this compatible with any engine brand other than MerCruiser?
No, this kit is specifically designed for the MerCruiser sterndrive models listed in the compatibility table (MC-I, R, MR, Alpha One, Alpha One Gen II, and Bravo series).
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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