LucaSng Tilt/Trim Sender Limit Kit — Fits MerCruiser MC-I, R, MR, Alpha One, Bravo, Two‑Wire Prewired

LucaSng Tilt/Trim Sender Limit Kit is a direct-fit replacement assembly for MerCruiser stern drives (MC-I, R, MR, Alpha One, Bravo) that restores proper trim-limit and sender functions using the included two-wire components.

This kit bundles a trim limit switch and a two-wire trim sender switch with pre-attached wire leads so you can replace worn or damaged components quickly. It replaces multiple OEM part numbers (including 805320A03, 805129A3, 805130A2, 18-7633) and is intended for units that use a two-wire tilt/trim sender configuration. Before installation, confirm your unit's model, type/code, spec, and serial number to ensure compatibility and avoid ordering the wrong part.

Will this kit fit my MerCruiser stern drive?

The kit fits MerCruiser MC-I, R, MR, Alpha One, Gen II and Bravo drives that use a two-wire tilt/trim sender. It can replace multiple OEM numbers, but fit depends on your exact transom and sender style.

• Designed for units using a two-wire trim sender configuration.
• Compatible with many Magnum Series transoms that accept the same sender type.
• Check OEM numbers: 805320A03, 805129A3, 805130A2, 18-7633 for match indication.
• Verify model, spec, type/code, and serial number before purchase for a secure fit.

How do I install the tilt/trim sender and limit switch?

Installation is straightforward for experienced DIYers and marine technicians: remove the old units, match wiring and mounting locations, then secure the new switches and reconnect wire leads. Use manufacturer torque specs and waterproof connections for reliable operation.

• Power off the boat and remove battery connections first.
• Compare the old parts to the new kit for matching mounting holes and wire colors.
• Use marine-grade connectors and dielectric grease on exposed terminals.
• Test trim travel slowly and inspect for smooth operation before finalizing installation.

What are the component specifics and what’s included?

The kit includes one trim limit switch and one two-wire trim sender switch, both supplied with pre-attached wire leads for easier replacement. Refer to the product images for size and mounting detail to ensure the part will align with your existing bracket or transom fitting.

• One trim limit switch with wire leads for mechanical cutoff at travel extremes.
• One two-wire trim sender switch with wire leads for position feedback.
• Standard replacement form factor for many MerCruiser drives and Magnum transoms.
• Images show dimensions and connector orientation—use them to confirm compatibility.

How can I be sure this will replace my OEM number?

Because this kit replaces several OEM numbers, the best practice is to compare the part labels and your drive's identification plate. If any detail differs or if you're uncertain, contact us with your drive model, type/spec, and serial number and we will help verify fitment.

• Match the OEM numbers printed on your old component to the replacement list.
• Check the drive model and serial number from the transom label for verification.
• Photograph the old sender and mounting area if you need expert confirmation.
• Contact support with part photos and drive info for compatibility help.

Who is this for: This LucaSng replacement kit is aimed at boat owners, marine technicians, and DIY repairers maintaining MerCruiser MC-I, R, MR, Alpha One, Gen II or Bravo stern drives that use a two-wire tilt/trim sender. It’s ideal when the existing trim limit or sender fails, gives intermittent readings, or when you’re restoring trim functionality during routine stern-drive maintenance. If you require help confirming fitment or installation guidance, reach out with your drive’s model and serial number so we can confirm compatibility before you order.