Boat Stern Drive Power Trim Sender Kit – Fits MerCruiser Alpha One, Gen 2 & Bravo (Replaces 805320A03, 805129A3, 805130A2)

Boat Stern Drive Power Trim Sender Kit – Fits MerCruiser Alpha One, Gen 2 & Bravo

This power trim sender kit is designed for a wide range of MerCruiser stern drives, including MC-I, R, MR, Alpha One, Alpha One Generation II, and Bravo models. It serves as a crucial replacement for faulty or inaccurate trim sensors, ensuring your trim gauge reading is reliable and the trim system operates within its proper limits.

It directly replaces multiple OEM part numbers, including Mercury/MerCruiser 805320A03 / 805320A1, 96863A15, 17693A2, 63115A12, 88678A4, and 88678A5, as well as Sierra 18-7633.

• Includes both the trim sender switch and the trim limit switch for a complete repair.
• Features wire leads with connectors for straightforward installation.
• Important: This part is not compatible 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 with Wire Leads (Replaces 805129A3)
• 1 x Trim Sender Switch with Wire Leads (Replaces 805130A2)
• 1 x Removal/Install Hinge Pin Tool (Replaces 91-78310/18-9861) (included with some aftermarket kits)
• 2 x Sets Traction Lines and Tape with Install Instructions (included with some aftermarket kits)

Installation Guide

1. Safety First: Disconnect the boat's battery before beginning any electrical work.
2. Access the Components: Locate the existing trim sender and limit switches. They are typically mounted on the gimbal housing near the hinge pins of the stern drive.
3. Disconnect Wiring: Carefully unplug the wire leads from the old switches. Note their routing for easier reconnection later.
4. Remove Old Switches: Use the appropriate tools, such as the hinge pin tool if provided, to remove the old sender and limit switch assemblies.
5. Install New Switches: Mount the new trim sender and limit switch in the original location, ensuring they are securely fastened.
6. Connect New Wiring: Connect the wire leads from the new switches, ensuring a secure connection.
7. Test Operation: Reconnect the battery. Operate the power trim system up and down to verify that the trim gauge responds correctly and that the trim stops at the preset limits.

Troubleshooting & FAQ

How do I confirm this kit will fit my MerCruiser Bravo X drive?
This kit is compatible with Bravo X, XR, and XZ models that use serial numbers 0W099999 and below and do not have quick connect fittings. Always verify your drive's serial number and wiring connector style before purchasing to ensure compatibility.

Will this work with my boat's SmartCraft system?
No, this trim sender kit is not compatible with SmartCraft systems. If your boat is equipped with SmartCraft, you will need a different part number.

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 trim gauge needle jumping around erratically, or the sterndrive not stopping automatically at its uppermost (trailer) or lowest trim positions.

Does this kit include everything required for installation?
The core components are the trim limit switch and the trim sender switch. Some versions of this aftermarket kit also include a hinge pin tool and traction lines for installation. Please check the "Package Contents" section to see what is included.

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.