Trim Sender Limit Kit – Fits MerCruiser Alpha One Gen 2 & Bravo Stern Drives (Replaces 805320A03, 805320A1)

Trim Sender Limit Kit – Fits MerCruiser Alpha One Gen 2 & Bravo Stern Drives

This trim sender and limit switch kit is designed for a wide range of MerCruiser stern drives, including MC-I, R, MR, Alpha One, Alpha One Gen II, and Bravo I, II, and III models. It ensures your trim system functions correctly by providing accurate position feedback and setting the upper trim limit.

This component is a direct replacement for MerCruiser part numbers 805320A03, 805320A1, 17693A2, 63115A12, 88678A4, 88678A5, and 96863A15. It also replaces Sierra part 18-7633 and Red Rhino part MR-971.

• Includes both the trim limit switch (port side) and the trim position sender (starboard side).
• Features wire leads with pre-installed electrical connectors for straightforward installation.
• Engineered to mount directly to the gimbal housing.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

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.

Technical Specifications

Package Contents

• 1 x Trim Sender & Limit Kit (805320A03)

Installation Guide

1. Safety First: Disconnect the boat's battery before beginning any electrical work.
2. Access the Components: Locate the old trim sender and limit switch on the gimbal housing of the stern drive.
3. Remove Old Wires: Carefully disconnect the wire leads from the old sensors.
4. Unbolt the Sensors: Remove the mounting hardware securing the old sender and limit switch. Clean the mounting surfaces.
5. Install New Sensors: Position the new trim position sender on the starboard side and the trim limit switch on the port side. Secure them with the original hardware.
6. Connect Wires: Attach the pre-installed electrical connectors to the corresponding terminals.
7. Test Operation: Reconnect the battery and test the trim and tilt functions to ensure the gauge reads correctly and the upper limit switch engages properly.

Troubleshooting & FAQ

How do I confirm this kit will fit my specific MerCruiser model?
Start by checking your original part for any of the numbers listed in our cross-reference table, such as 805320A03 or 805320A1. Next, verify your engine model is listed in the "Compatible Engine Models" section. When in doubt, consulting a marine mechanic is recommended.

What are the common symptoms of a failing trim sender or limit switch?
Failure symptoms include an inaccurate or non-functional trim gauge, the drive trimming up or down on its own, or the trim motor not stopping at the preset upper limit ("trailer" position). This can lead to improper boat handling and potential damage to the stern drive.

Is this a complete kit for both sides of the stern drive?
Yes, this is a complete kit containing both the trim position sender (for the gauge, typically on the starboard side) and the trim limit switch (for setting the maximum trim angle, typically on the port 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.