Ignition Switch – Fits Mercury Mariner Outboard Motors (Replaces 87-17009A5, 87-17009A2)

Ignition Switch – Fits Mercury Mariner Outboard Motors (Replaces 87-17009A5, 87-17009A2)

This panel-mounted ignition switch is designed for Mercury and Mariner outboard motors, including DFI, EFI, and MPI engines. It provides reliable Off-Run-Start functionality and includes a push-to-choke feature integrated into the start position for easier cold starts.

Engineered to meet OEM specifications, this switch serves as a direct replacement for several Mercury, Sierra, and Marinepro part numbers, ensuring a precise fit and function. Its heavy-duty potted construction offers durability and protection against the harsh marine environment.

• Installation: Mounts into a standard 7/8" hole in panels up to 5/8" thick.
• Functionality: 3-position switch (Off-Run-Start) with a push-to-choke feature.
• Connections: Features 6 color-coded wire leads for straightforward installation.

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.

Mercury/Mariner Outboard Applications

Compatible Control Box Applications

Technical Specifications

Package Contents

• 1 x Ignition Key Switch (87-17009A5)
• 2 x Ignition Keys

Installation Guide

1. Safety First: Disconnect the battery cables (negative first) to prevent electrical shorts.
2. Access the Switch: Open or remove the control box or dash panel to access the back of the ignition switch.
3. Label Wires: Before disconnecting, carefully label each wire with its corresponding terminal position on the old switch.
4. Remove Old Switch: Disconnect the wires and unscrew the mounting nut to remove the old ignition switch from the panel.
5. Install New Switch: Insert the new switch into the panel and secure it with the provided face nut.
6. Reconnect Wires: Attach the wires to the correct terminals on the new switch according to your labels.
7. Test Functionality: Reconnect the battery (positive first) and test all switch positions (Off, Run, Start, and Push-to-Choke) to ensure proper operation.
8. Final Assembly: Reassemble the dash panel or control box housing.

Troubleshooting & FAQ

Q: How do I confirm this switch fits my specific engine?

A: First, check the Part Number Cross-Reference table to see if your old part number is listed. Next, review the Compatible Engine Models tables. For Mercury owners, we highly recommend using the linked Serial Number Guide to verify your engine model and year before ordering.

Q: What are the common signs of a failing ignition switch?

A: Symptoms include the engine failing to start, intermittent power loss to accessories while running, the key feeling loose or difficult to turn, or the starter not engaging when the key is turned to the start position.

Q: What does "Push to Choke" mean?

A: This feature is used for cold starts. Pushing the key in while in the "Start" position activates the choke/primer system, which enriches the fuel-to-air mixture to help the engine start more easily.

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.