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Trim Sender Limit Kit – Fits MerCruiser Alpha One Gen 2 & Bravo Stern Drives (Replaces 805320A03, 805320A1)
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Trim Sender Limit Kit – Fits MerCruiser Alpha One Gen 2 & Bravo Stern Drives
This trim sender limit kit is designed for a wide range of MerCruiser stern drives, including MC-I, R, MR, Alpha One, Alpha One Generation 2, and Bravo I, II, and III models. The kit provides a complete replacement solution for both the trim position sender and the trim limit switch assemblies.
This component is a direct replacement for MerCruiser part numbers: 805320A03, 805320A1, 17693A2, 63115A12, 88678A4, and 88678A5. It also cross-references with Sierra 18-7633, Red Rhino MR-971, REC805320A03, and RM805320A1.
- Includes both the trim position sender and trim limit switch.
- Features wire leads with pre-installed electrical connectors for easier installation.
- Mounts directly to the gimbal housing.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| MerCruiser | 805320A03 |
| MerCruiser | 805320A1 |
| MerCruiser | 17693A2 |
| MerCruiser | 63115A12 |
| MerCruiser | 88678A4 |
| MerCruiser | 88678A5 |
| Sierra | 18-7633 |
| Red Rhino | MR-971 |
| REC | REC805320A03 |
| RM | RM805320A1 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| MerCruiser | MC-I | N/A | 4-Stroke | 805320A03 | |
| MerCruiser | R | N/A | 4-Stroke | 805320A03 | |
| MerCruiser | MR | N/A | 4-Stroke | 805320A03 | |
| MerCruiser | Alpha One | N/A | 4-Stroke | 805320A03 | |
| MerCruiser | Alpha One Gen 2 | N/A | 4-Stroke | 805320A03 | |
| MerCruiser | Bravo I | N/A | 4-Stroke | 805320A03 | |
| MerCruiser | Bravo II | N/A | 4-Stroke | 805320A03 | |
| MerCruiser | Bravo III | N/A | 4-Stroke | 805320A03 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Tilt/Trim Sender Limit Kit |
| Installation | Direct replacement |
| Connection | Wire leads with electrical connectors |
| Fitting Type | Direct mount to gimbal housing |
| Other Technical Attributes | Trim limit switch on port side; trim position sender on starboard side |
Package Contents
- 1 x Trim Sender & Limit Kit (805320A03)
Installation Guide
- Disconnect the battery before beginning work to ensure safety.
- Locate the trim limit switch on the left (port) side of the gimbal housing and the trim position sender on the opposite (starboard) side.
- Remove the old sender and limit switch assemblies, taking care to note the wire routing.
- Install the new components, ensuring they are correctly positioned.
- For Alpha One Gen 2 drives, confirm the trim adjustment dimension is 20-3/4 inches from the center of the gimbal ring hinge pin to the center of the upper drive shaft yoke.
Troubleshooting & FAQ
How do I confirm this fits my engine?
This kit is designed for MerCruiser MC-I, R, MR, Alpha One, Alpha One Gen 2, and Bravo stern drives. The best way to confirm fitment is to match your old part's number to the numbers in our cross-reference table. Key OEM part numbers are 805320A03 and 805320A1.
What are the signs that my trim sender or limit switch is failing?
Common symptoms include an inaccurate or non-functional trim gauge on your dashboard, the drive trimming up or down on its own, or the trim motor failing to stop at the set upper or lower limits.
Where are these components located?
The trim limit (TL) switch is installed on the port (left) side of the gimbal housing, while the trim position (TP) sender is mounted on the starboard (right) side.
OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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