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

Starter Solenoid Relay – Fits Mercury Outboard & Force Marine 40-250 HP

This starter solenoid relay is designed for a wide range of Mercury and Force marine outboard engines. It provides a reliable replacement for models from 1996 and newer, covering various 3-cylinder, 4-cylinder, and V6 outboards from 40 HP to 250 HP.

This component directly replaces multiple OEM and aftermarket part numbers, including Mercury 89-817109A1, 89-817109A2, and 89-817109A3, Sierra 18-5834, and Arco SW109. Please see the cross-reference table for a complete list of compatible part numbers.

• Installation: Screw mount with screw terminals for secure and straightforward connection.
• Construction: Features silver alloy contacts for excellent conductivity and a normally open contact type.
• Compatibility: Designed for 12V DC systems.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Confirm your engine model/year in the table below.

Mercury Marine

Force Marine

Technical Specifications

Package Contents

• 1 x Starter Solenoid Relay (Replaces 89-817109A1 / 89-817109A2 / 89-817109A3)

Installation Guide

1. Disconnect Battery: Always disconnect the negative battery cable before beginning any electrical work to prevent short circuits.
2. Locate Solenoid: Find the existing starter solenoid on your engine. It is typically mounted near the starter motor.
3. Label and Disconnect Wires: Take a photo or label the wires connected to the solenoid's terminals before disconnecting them. This ensures correct reassembly.
4. Remove Old Solenoid: Unbolt the old solenoid from its mounting bracket and remove it.
5. Mount New Solenoid: Secure the new solenoid onto the mounting bracket. Ensure it is firmly attached.
6. Reconnect Wires: Attach the wires to the corresponding terminals on the new solenoid according to your labels or photo. Ensure all connections are tight.
7. Reconnect Battery: Reattach the negative battery cable.
8. Test Operation: Turn the ignition key to test the starter. Listen for a solid click from the solenoid and ensure the engine cranks properly.

Troubleshooting & FAQ

Q: How do I confirm this solenoid will fit my specific Mercury engine?

A: The most reliable way is to match your engine's serial number with the ranges provided in the "Compatible Engine Models" table. If your serial number falls within the specified range for your model, this part will fit.

Q: What are the common symptoms of a failing starter solenoid?

A: Common signs include a single, loud "click" but the starter motor doesn't turn, the starter motor running without engaging the flywheel, or intermittent starting issues where the engine only cranks sometimes.

Q: Is this part a direct replacement for Sierra 18-5834?

A: Yes, this solenoid is a direct cross-reference for Sierra part numbers 18-5834 and 18-5835, among others. Refer to our "Part Number Cross-Reference" table for a full list.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.