HNeekyr 12V Power Trim Solenoid Starter for Mercury/Mariner 35–275 HP — Pair, OE-Fit High-Temp Copper

The HNeekyr 12V trim solenoid starter is a direct-fit replacement for Mercury/Mariner outboard engines (35–275 HP) that restores power trim and tilt function with easy bolt-on installation.

If your boat’s trim/tilt stopped responding or the original solenoid shows corrosion, this HNeekyr 12V power trim solenoid offers an affordable replacement engineered to match OE fit and function. Designed for a wide range of Mercury and Mariner outboards as well as compatible stern drives, the unit arrives as a pair so you can replace a failing solenoid and keep a spare on board. The body uses robust plastic housing with heavy-gauge copper windings rated to 180°C, and the electrical connections mimic factory geometry for a straightforward swap.

Which engines and part numbers does this solenoid work with?

This solenoid supports many Mercury and Mariner outboards from 35 HP up to 275 HP and fits certain MerCruiser stern drives that use SAE J1171 marine trim pumps. It replaces several OEM numbers commonly found in these systems.

• Compatible HP range: 35–275 HP and 3.7L engine families
• Replaces OEM references: 89-846070, 89-94318, 89-96158T, 89-818864T and variants
• Works with MerCruiser stern drives and SAE J1171 trim pumps when matching OEM part numbers

How reliable and durable is the HNeekyr power trim solenoid?

The internal coil uses high-temperature 180°C copper wire, and the exterior shell is molded plastic chosen for marine resistance. While this is an aftermarket part rather than an original-equipment unit, it is built to meet OE standards for electrical conductivity and mechanical fit.

• High-temp copper winding for better conductivity under load
• Sturdy plastic housing resists moisture and corrosion
• Manufactured to match original mounting points and electrical terminals

Is installation difficult and what comes in the box?

Installation is designed to be fast and accessible: no new holes, no specialty tools—just remove the old solenoid and bolt the HNeekyr unit in place. The package includes two 12V trim solenoids so you can replace the failed unit and keep a backup.

• Simple bolt-on replacement: no drilling required
• Includes 2 solenoids per order for immediate spare usage
• Typical deck-side installation time: minutes for someone with basic tools

What should I check before buying to ensure compatibility?

Confirm the OE part number on your existing solenoid before ordering to avoid mismatches. Compare terminal layout, mounting hole spacing and the vehicle’s listed compatible HP range to be certain this aftermarket part will fit correctly.

• Verify the existing part number against the listed replacement numbers
• Check physical terminal orientation and bolt pattern on your unit
• Confirm your engine falls within the specified HP and model families

Who this is for: boat owners, marine technicians and DIYers who need a reliable, cost-effective replacement for a failed 12V trim/tilt solenoid on Mercury, Mariner or compatible MerCruiser applications. If you want an aftermarket unit that mirrors OEM fit and function, arrives as a two-piece kit, and installs quickly without special tools, the HNeekyr trim solenoid is built to get your power trim working again while holding a spare for future convenience.