SKU: 24374000821

Spark Plug Ignition Coil Wire Set – Fits Mercruiser 5.0L, 5.7L, 6.2L MPI V8 Engines (Replaces 84-863656A1, 18-8828)

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Description

Spark Plug Ignition Coil Wire Set – Fits Mercruiser 5.0L, 5.7L, 6.2L MPI V8 Engines (Replaces 84-863656A1, 18-8828)Spark Plug Ignition Coil Wire Set Fits Mercruiser 5. 0L, 5. 7L, 6. 2L MPI V8 Engines This spark plug ignition wire set is designed for Mercruiser MPI engines including the 5. 0L, 5. 7L, and 6. 2L V8 sterndrive and inboard motors. It is compatible with models that use a flat cap distributor, primarily manufactured from the late 1990s through the mid 2000s. This kit serves as a direct replacement for Mercruiser part number 84 863656A1, Sierra 18 8828,

Spark Plug Ignition Coil Wire Set – Fits Mercruiser 5.0L, 5.7L, 6.2L MPI V8 Engines

This spark plug ignition wire set is designed for Mercruiser MPI engines including the 5.0L, 5.7L, and 6.2L V8 sterndrive and inboard motors. It is compatible with models that use a flat cap distributor, primarily manufactured from the late 1990s through the mid-2000s.

This kit serves as a direct replacement for Mercruiser part number 84-863656A1, Sierra 18-8828, and others, ensuring a precise fit and reliable performance for your marine engine's ignition system.

  • Installation Method: Direct Fit Replacement
  • Included Components: The set contains 8 spark plug wires and 1 coil wire for a complete installation.
  • Durable Construction: Built with silicone housing and stainless steel conductors to resist heat, vibration, and corrosion common in marine environments.

Part Number Cross-Reference

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

Brand Part Number
Mercruiser 84-863656A1 / 84863656A1
Sierra 18-8828 / 18-8828-1
CDI 631-0011
Indmar 751104 / 756004
Mallory 9-28009

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.

Brand Model Stroke Years OEM Part No.
Mercruiser 5.0L MPI Alpha/Bravo 4-Stroke Late 1990s-2000s (s/n 0M300000 and up) 84-863656A1
Mercruiser 5.0L MPI Alpha/Bravo EC 4-Stroke 2000s (s/n 1A300000 and up) 84-863656A1
Mercruiser 350 Horizon Bobtail 4-Stroke 84-863656A1
Mercruiser 350 MPI Alpha 4-Stroke 84-863656A1
Mercruiser 350 MPI Alpha/Bravo 4-Stroke 84-863656A1
Mercruiser 350 MPI Bravo 4-Stroke 84-863656A1
Mercruiser 350 MAG MPI Alpha/Bravo 4-Stroke 84-863656A1
Mercruiser 350 MAG MPI Horizon Alpha/Bravo 4-Stroke 84-863656A1
Mercruiser 350 MAG MPI Horizon MIE 4-Stroke 84-863656A1
Mercruiser 350 MAG MPI Horizon Alpha/Bravo EC 4-Stroke 2000s (s/n 1A300000 and up) 84-863656A1
Mercruiser 350 MAG MPI MIE 4-Stroke 84-863656A1
Mercruiser 350 MAG MPI SKI 4-Stroke 84-863656A1
Mercruiser 5.7L MPI Horizon MIE 4-Stroke 2000s (s/n 1A090000 and up) 84-863656A1
Mercruiser 5.7L MPI MIE 4-Stroke 2000s (s/n 1A090000 and up) 84-863656A1
Mercruiser 5.7L MPI MIE EC 4-Stroke 2000s (s/n 1A090000 and up) 84-863656A1
Mercruiser 5.7L MPI SKI 4-Stroke 2000s (s/n 1A090000 and up) 84-863656A1
Mercruiser 5.7L MPI TOW 4-Stroke 84-863656A1
Mercruiser 5.7L MPI SKI EC 4-Stroke 84-863656A1
Mercruiser 5.7L MPI Towsport with GEN III 4-Stroke 2000s (s/n 1A091881 and up) 84-863656A1
Mercruiser 377 MAG MPI Bravo 4-Stroke 2000s (s/n 1A300000 and up) 84-863656A1
Mercruiser 377 MAG MPI Bravo EC 4-Stroke 2000s (s/n 1A343300 and up) 84-863656A1
Mercruiser 383 MAG Stroker Bravo 4-Stroke 84-863656A1
Mercruiser 383 MAG Stroker Inboard 4-Stroke 84-863656A1
Mercruiser 383 MPI FWC Bravo 4-Stroke 84-863656A1
Mercruiser 385 Performance Tuned 4-Stroke 84-863656A1
Mercruiser 6.2L MPI Horizon MIE 4-Stroke 2000s (s/n 1A090000 and up) 84-863656A1
Mercruiser 6.2L MPI MIE 4-Stroke 2000s (s/n 1A090000 and up) 84-863656A1
Mercruiser 6.2L MPI MIE EC 4-Stroke 2000s (s/n 1A091600 and up) 84-863656A1
Mercruiser MX 6.2L MPI Bravo 4-Stroke Late 1990s-2000s (s/n 0M300000–1A299999) 84-863656A1
Mercruiser MX 6.2L MPI Horizon Bravo 4-Stroke Late 1990s-2000s (s/n 0M300000–1A299999) 84-863656A1
Mercruiser MX 6.2L MPI Horizon MIE 4-Stroke Late 1990s-2000s (s/n 0M310000–1A089999) 84-863656A1
Mercruiser MX 6.2L MPI MIE 4-Stroke Late 1990s-2000s (s/n 0M310000–1A089999) 84-863656A1
Mercruiser MX 6.2L MPI SKI 4-Stroke Late 1990s-2000s (s/n 0M317000–0W689999) 84-863656A1

Technical Specifications

Specification Value
Product Type Spark Plug Ignition Wire Set
Installation Direct Fit Replacement
Fuel Type Gasoline
Connection Flat Cap Distributor
Housing Material Silicone, Stainless Steel Conductors
Wire Sizes 8 Spark Plug Wires + 1 Coil Wire
Wire Lengths 2x 22" (55.9cm), 2x 27" (68.6cm), 2x 31" (78.7cm), 2x 36.5" (92.7cm), 1x 21" (53.3cm) Coil Wire
Warranty 1 Year
Other Technical Attributes Designed to resist heat, vibration, and corrosion in marine environments

Package Contents

This ignition wire set includes the following components:

  • 2x Spark Plug Wires — 22 inches (55.9cm)
  • 2x Spark Plug Wires — 27 inches (68.6cm)
  • 2x Spark Plug Wires — 31 inches (78.7cm)
  • 2x Spark Plug Wires — 36.5 inches (92.7cm)
  • 1x Coil Wire — 21 inches (53.3cm)

Installation Guide

  1. Safety First: Disconnect the boat's battery before beginning any electrical work to prevent accidental shocks or shorts.
  2. One at a Time: To avoid mixing up firing order, replace one spark plug wire at a time. Start with the shortest wire, remove the old one, and match its length to a new one from the kit.
  3. Distributor Cap Connection: Firmly press the new wire's boot onto the correct terminal on the distributor cap until it clicks into place.
  4. Spark Plug Connection: Route the wire to the corresponding spark plug, ensuring it follows the original path and is clear of hot or moving parts. Push the boot onto the spark plug until it seats securely.
  5. Repeat Process: Continue this process for all remaining spark plug wires and the coil wire.
  6. Final Check: Once all wires are replaced, double-check that each connection is secure at both the distributor and the spark plug. Reconnect the battery and start the engine to test for smooth operation.

Troubleshooting & FAQ

How do I confirm this fits my engine?
First, check the compatibility table on this page. This set is for Mercruiser 5.0L, 5.7L, and 6.2L MPI V8 engines with a flat cap distributor. Cross-reference your engine's original wire set part number with those listed, such as Mercruiser 84-863656A1 or Sierra 18-8828.

What are the signs my old ignition wires are failing?
Common symptoms of bad spark plug wires include engine misfires (especially under load), rough idling, decreased power, poor fuel economy, and visible signs of wear like cracks, burns, or corrosion on the wire boots or jackets.

What lengths are the wires in this kit?
The set contains a total of nine wires: two 22", two 27", two 31", two 36.5", and one 21" coil wire. This variety ensures a proper fit for all cylinders on compatible V8 engines.

OEM vs. Aftermarket?
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.

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

What is your warranty and return policy?
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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 24374000821

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Reviewed in the United States on May 18, 2025
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★★★★★ 5
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Reviewed in the United States on September 10, 2025
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Mary Freeman
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amazing
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Reviewed in the United States on April 13, 2026
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Steve
Birmingham, US
★★★★★ 4
3.5, Not 3.0
Color: Medium Set of 6
These balls were almost exactly what I needed. I was replacing my boy’s favorite ball, which is the 3” squeaky, spikey ball that fits in the chuck it launcher. Unfortunately I saw the shiny object next to it and because there were SIX balls and a dollar less, I failed to see that these are 3.5” balls instead of 3”…. Great balls but no fitty in the slingy. Buyer beware. No chuck it no problem. Save a buck.
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Color: Samll Set of 8
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