Spdtmhc 12V Trim/Tilt Starter Solenoid Relays (2-Pack) for Mercury/Mariner 35–275 HP — Direct-Fit, OEM Cross-Reference

Two 12V trim/tilt starter solenoid relays designed as direct-fit replacements for many Mercury and Mariner outboard engines, sold as a pair for convenient swap-outs.

If your outboard’s trim or starting circuit is behaving intermittently, worn relay solenoids are a common cause. These two Spdtmhc relays are engineered to match multiple OEM part numbers used across Mercury and Mariner models (35–275 HP ranges, various serials listed), making them a practical spare or replacement for routine maintenance and troubleshooting.

Which engines and part numbers will these relays fit?

These relays were produced to be compatible with a broad set of Mercury and Mariner outboards, covering small to large horsepower models and several OEM reference numbers. Always cross-check the OEM numbers and terminal types on your existing relay before installing.

• Covers Mercury/Mariner 35–275 HP families and specific variants (including Magnum II and XR-4 series).
• Fits multiple referenced part numbers such as 89-96158, 89-94318, 89846070 and their 'T' variants.
• Includes units that use 8-32 and 1/4-20 terminal configurations where indicated.

How do these relays affect trim and starting performance?

Relay solenoids act as electrical switches that send battery power to the starter motor and trim pump. Replacing a failing relay restores reliable current flow, which can eliminate unpredictable starting behavior and sluggish trim operation.

• Restores consistent starter engagement and reduces voltage drop under load.
• Helps the trim pump receive steady power for reliable tilt adjustments.
• Sold as a pair for replacing both sides or keeping a spare on board.

What do I need to check before buying and installing?

Confirming fit and terminal types is essential to avoid installation issues. Inspect the label or the old unit’s terminals, and verify the part numbers listed on your engine or parts manual before purchase.

• Compare the OEM numbers stamped on your current relay to the compatible list provided.
• Verify terminal thread types (8-32, 1/4-20) and wire routing to ensure correct connections.
• Turn off battery power and note wiring positions before removing the original relay.

What comes in the package and are there installation tips?

The product ships as a set of two relay solenoids and includes compatibility documentation. Follow standard marine electrical safety and torque recommendations during installation, and recheck connections after a short test run.

• Package contains 2 x 12V solenoid relay units ready for replacement use.
• Undergoes factory quality checks; still verify fit before final installation.
• Not affiliated with or produced by the original engine manufacturer; sold as aftermarket replacements.

Who is this for: boat owners, marine mechanics, and fleet operators who service Mercury or Mariner outboards and need dependable replacement trim/tilt and starter relays. Choose this twin-pack if you want an economical way to swap failing relays, keep a ready spare on board, or service paired systems for balanced performance.