HNeekyr 12V Trim Solenoid Starter for Mercury Mariner Outboards — 2-Pack, Fits 35–275 HP, 180°C Copper

HNeekyr 12V Trim Solenoid Starter is a direct-fit replacement for many Mercury Mariner outboard engines, restoring reliable power trim and starter relay function without modifying your motor.

This 12V trim solenoid from HNeekyr is engineered to match the electrical and mechanical requirements of Mercury Mariner outboard motors and compatible stern drives. Built with high-temperature copper windings and a robust plastic housing, it replaces a range of OE numbers and installs quickly with standard tools. The unit is sold in a two-pack, making it convenient to carry a spare or replace both banks on multi-engine setups.

Which engines and models is this trim solenoid compatible with?

The HNeekyr trim solenoid is designed to fit Mercury Mariner outboards ranging from 35 HP up to 275 HP and 3.7L models, and it also works with MerCruiser stern drives that use SAE J1171 marine trim pumps. Before purchasing, compare your current solenoid's OE number with the listed replacement numbers to ensure fitment.

• Fits Mercury Mariner outboards 35–275 HP and 3.7L engines
• Compatible with MerCruiser stern drives using SAE J1171 pumps
• Cross-references OE numbers: 89-846070, 89-94318, 89-96158T, and others
• Supplied as a pair for convenience or dual-engine use

How is the build quality and electrical performance?

HNeekyr uses 180°C-rated copper windings inside a durable plastic housing to provide improved conductivity and thermal tolerance compared with lower-grade alternatives. The design aims to meet OE specification for electrical contact and mechanical mounting so the solenoid performs consistently under marine conditions.

• 180°C copper wire for reliable current handling
• Sturdy plastic housing resists corrosion and vibration
• OE-style terminals and mounting points for direct substitution
• Manufactured to match original electrical characteristics

How easy is installation and what tools are needed?

Installation is straightforward and intended as a bolt-on replacement: no drilling or special tools are required. Most owners can complete the swap with common hand tools and basic electrical knowledge; the package includes two identical 12V solenoids ready for direct installation.

• No drilling required—uses existing mounting points
• Standard wrenches and screwdrivers are usually sufficient
• Two-piece set allows immediate replacement or spare storage
• Confirm OE number before installation to ensure compatibility

What replacement numbers and fit notes should I verify?

To avoid ordering the wrong part, compare your current solenoid’s part number against the replacement list supplied by HNeekyr. The product replaces several common OE numbers, but OEM designations vary by model year—double-check fitment for your exact engine.

• Replaces: 89-846070, 89-94318, 89-96158T, 89-818864T, 89-96158, and variants
• Also listed as 89846070, 8994318, 8996158T, 89818864T, 8996158
• Confirm matching connector, terminal layout, and mounting holes
• Contact seller with your engine year/model for fitment help

Who is this for: Boaters and marine technicians who need an affordable, OE-style 12V trim solenoid replacement for Mercury Mariner outboards or compatible MerCruiser stern drives. It’s ideal for owners who prefer a ready-to-install, heat-rated copper-wound solenoid sold as a two-pack for convenience, plus anyone maintaining multiple engines or keeping a spare part aboard for quick field swaps.