Power Trim Sender Kit – Fits MerCruiser MC-I, R, MR, Alpha One, Alpha One Gen II, and Bravo Stern Drives (Replaces 805320A03)

Power Trim Sender Kit – Fits MerCruiser MC-I, R, MR, Alpha One, Alpha One Gen II & Bravo Stern Drives

This power trim sender kit is designed for a wide range of MerCruiser stern drives, including MC-I, R, MR, Alpha One, Alpha One Gen II, and Bravo models. It provides a reliable replacement for original components to ensure accurate trim level readings.

This kit serves as a direct replacement for Mercury/Quicksilver parts 805320A03 and 805320A1; Sierra part 18-7633; and MerCruiser parts 96863A15, 17693A2, 63115A12, 88678A4, and 88678A5.

• Includes both the trim limit switch and trim sender switch.
• Engineered for stern drive installations with a 2-wire connection.
• Important: Not for use with SmartCraft systems.

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 Limit Switch
• 1 x Trim Sender Switch
• 2 x Wire Leads

Installation Guide

1. Safety First: Disconnect the boat's battery before starting any electrical work.
2. Locate Components: Identify the old trim limit and sender switches on the stern drive assembly.
3. Disconnect Wiring: Carefully unplug the wire leads connecting the old switches to the main harness.
4. Remove Old Switches: Unbolt and remove the old trim sender and limit switch from their mounting points.
5. Install New Switches: Mount the new switches, ensuring they are securely fastened in the correct orientation.
6. Connect New Wiring: Attach the new wire leads, ensuring a secure and clean connection.
7. Reconnect Power: Reconnect the boat's battery.
8. Test Operation: Power on the ignition and test the power trim to confirm the gauge and limit functions are working correctly.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my engine?
A: This kit is designed for MerCruiser MC-I, R, MR, Alpha One, Alpha One Gen II (1991 and newer), and Bravo stern drives. The most reliable method is to match your existing part number to one of the direct replacements listed, such as 805320A03 or 18-7633.

Q: What are the symptoms of a failing trim sender?
A: Common signs include an erratic or non-functional trim gauge on your dashboard, or the trim motor not stopping at the correct upper or lower limits. This can be caused by corrosion or internal failure of the sender or limit switch.

Q: Will this kit work with my SmartCraft system?
A: No. This power trim sender kit is not compatible with any MerCruiser engines equipped with a SmartCraft digital network system. Using it with an incompatible system will result in incorrect readings.

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.