Sierra Marine Trim Sender and Limit Kit 18-7633 — Direct-Fit Replacement for Mercruiser Drives, Universal-Fit

The Sierra International 18-7633 Marine Trim Sender and Limit Kit is a direct-fit replacement for many Mercruiser stern drive trim senders and limit switches, restoring accurate trim position sensing and travel limits.

This kit from Sierra is engineered to match or exceed the original equipment it replaces, offering compatibility with MC‑I, R, MR, Alpha, Alpha Gen II and Bravo drives. It is manufactured to be interchangeable with several Mercruiser part numbers, letting you repair trim sensing and limit control without modifying the drive. The package is compact and lightweight, making it convenient to store in a parts locker onboard or in your workshop.

Which outboard and stern drive models does this kit work with?

The 18‑7633 kit is designed for a broad range of Mercruiser-style stern drives and related models. It supports both earlier and later-generation Alpha and Bravo units as well as MC‑I, R and MR series drives, simplifying parts selection for many service jobs.

• Compatible with MC‑I, R, MR, Alpha, Alpha Gen II and Bravo drives
• Interchangeable with Mercruiser part numbers such as 17693A2, 63115A12 and 805320A03
• Works with a variety of OEM configurations to minimize modification needs

How does this sender and limit kit improve trim control?

Replacing a worn or faulty trim sender and limit switch restores reliable feedback to your trim system so the helm can accurately report and control trim position. This helps the tilt/trim system operate within its intended travel range and prevents erratic readings that can lead to improper trim adjustments.

• Restores accurate trim position sensing for consistent helm feedback
• Re-establishes upper and lower travel limits to protect the drive
• Reduces intermittent or incorrect trim readings that affect handling

What are the key specs and installation considerations?

The kit ships as a universal-fit replacement with compact packaging dimensions and modest weight, making it easy to handle during repairs. Installation typically follows the original mounting locations and electrical connectors, but confirm fit with your specific drive model and wiring harness before starting.

• Universal-fit design for many Mercruiser-style stern drives
• Package dimensions: 12.446 H × 7.112 L × 10.668 W centimeters; weight: 0.318 kg
• Country of origin: China — built to meet or exceed OEM specifications

Will this part directly replace the Mercruiser numbers listed?

Yes — the Sierra 18‑7633 is manufactured to be interchangeable with a list of Mercruiser replacement numbers, allowing direct substitution in most service scenarios. Always compare the physical connector, mounting points and electrical pinout to confirm seamless replacement.

• Interchangeable with multiple Mercruiser part numbers for quick swap-out
• Matches OEM form, fit and function to minimize adaptation
• Recommended to verify plug and bracket alignment during purchase

Who is this for: Technicians, boat owners and marine mechanics who need a reliable replacement trim sender and limit kit for Mercruiser-style stern drives. If you maintain or restore Alpha, Bravo, MC‑I, R or MR drives and want a component that meets OEM-level expectations, the Sierra 18‑7633 provides a cost-effective option to bring trim systems back to proper operation.