Starter Solenoid Relay – Fits Mercury, Force 40-250 HP (Replaces 89-817109A1, 89-817109A2, 89-817109A3)

Product Details

This high-quality Starter Solenoid Relay provides a reliable replacement for a wide range of Mercury and Force outboard engines. It is designed for compatible 40–250 HP Mercury Marine outboards from 1996 and newer (including 3-cylinder, 4-cylinder, and V6 models), as well as 40–120 HP Force Marine outboards from 1996–1999.

It serves as a direct interchange for numerous OEM and aftermarket part numbers, including Mercury 89-817109A1, Sierra 18-5834, and Arco SW109, ensuring broad compatibility.

• Installation Method: Screw Mount
• Connection Type: Screw Terminal
• Contact Material: Silver Alloy for reliable conductivity

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model and year/serial number in the tables below to ensure proper fitment.

For Mercury Marine Engines: Compatible with a wide range of 40-250 HP outboards manufactured from 1996 onwards. Please verify your engine's serial number against the listed ranges.

For Force Marine Engines: Compatible with select 40-120 HP models from 1996–1999. Check your serial number to confirm.

Technical Specs

Product Type

Starter Solenoid Relay

Installation

Screw Mount

Connection

Screw Terminal

Contact Material

Silver Alloy

Contact Type

Normally Open

Current Rating

60 Amps

Housing Color

Black

Operating Voltage

12V DC

What’s in the Box

• 1 x Starter Solenoid Relay, cross-compatible with OEM numbers 89-817109A1, 89-817109A2, and 89-817109A3.

Installation Notes

For a safe and effective installation, follow these general steps. Always refer to your engine's service manual for detailed instructions.

1. Disconnect Power: Ensure the engine is off and disconnect the negative terminal from the battery to prevent electrical shorts.
2. Locate the Solenoid: Identify the existing starter solenoid relay on your engine. It is typically mounted near the starter motor.
3. Document Wiring: Before disconnecting, take a clear photo or label each wire connected to the solenoid terminals to ensure correct reassembly.
4. Disconnect Wires: Carefully remove the nuts and disconnect all electrical leads from the old solenoid.
5. Remove Old Solenoid: Unbolt the solenoid from its mounting bracket and remove it.
6. Install New Solenoid: Mount the new solenoid in place, ensuring it is secure.
7. Reconnect Wires: Attach the electrical leads to the correct terminals on the new solenoid based on your earlier documentation. Ensure all connections are tight.
8. Reconnect Battery & Test: Reconnect the battery's negative terminal. Turn the ignition key to test the starting system and confirm the new solenoid operates correctly.

Troubleshooting & FAQ

Safety & Important Info

• Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.