9-inch Spark Plug Wire – Fits Mercury Marine 150-175-200HP Outboards

9-inch Spark Plug Wire – Fits Mercury Marine 150-175-200HP Outboards

This 9-inch spark plug wire is designed to fit a range of Mercury Marine V6 2-stroke outboard engines, including 150, 175, and 200 HP models, primarily from the 1970s through the 1990s. It serves as a reliable replacement for restoring ignition system performance.

This component is a direct replacement for Mercury OEM part numbers 813715A1, 90816A25, 93475A25, 99215A25, and 99215A29, as well as aftermarket parts from Sierra (18-5228-1, 18-5227-1) and AquaPower (A/P3026).

• Installation Method: Simple direct plug-in replacement.
• Connection Type: Connects the ignition coil to the spark plug.
• Core Construction: Features a stainless steel wound conductor with silicone jacketing for durability and RFI suppression.

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.

Technical Specifications

Package Contents

Includes one (1) spark plug wire, equivalent to part numbers: 813715A1, 90816A25, 93475A25, 99215A25.

Installation Guide

1. Safety First: Ensure the engine is completely turned off, cool to the touch, and the battery is disconnected.
2. Locate Wire: Identify the specific spark plug wire you are replacing. It's often best to replace one wire at a time to avoid mixing up connections.
3. Remove Old Wire: Gently grasp the boot at the spark plug end, twist slightly, and pull it straight off. Do the same for the ignition coil end.
4. Verify Fit: Compare the new wire with the old one to ensure the length and boot angles match.
5. Prep New Wire: Apply a small amount of dielectric grease to the inside of each boot to ease installation and improve sealing.
6. Install New Wire: Firmly press the coil-side boot onto the ignition coil terminal until you feel it click into place.
7. Connect to Plug: Route the wire correctly and press the other boot firmly over the spark plug until it is fully seated.
8. Final Check: Reconnect the battery, start the engine, and listen for a smooth idle to confirm proper installation.

Troubleshooting & FAQ

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

A: The most reliable method is to match your old part number to the ones listed in our cross-reference table. You can also use our compatibility table to check your engine model, HP, and year range. For Mercury engines, using the serial number guide is highly recommended for precise identification.

Q: What are the common signs of a failing spark plug wire?

A: Symptoms of a bad wire include engine misfires (especially under load), a rough or unstable idle, decreased acceleration and power, and potentially radio frequency interference (RFI) causing static on your marine radio or electronics.

Q: Is there a quality difference between this aftermarket wire and an OEM one?

A: This is an aftermarket part built to meet or exceed original equipment manufacturer (OEM) specifications. It features a durable silicone jacket, a Kevlar-reinforced core, and a stainless steel wound conductor for excellent conductivity and RFI suppression, similar to high-quality OEM parts.

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.