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Mercruiser Spark Plug Wire Set - Fits 5.0L, 5.7L & 6.2L MPI V8 Engines (Replaces 84-863656A1)
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Mercruiser Spark Plug Wire Set - Fits 5.0L, 5.7L & 6.2L MPI V8 Engines
This spark plug wire set is designed for V-8 MerCruiser stern drive and inboard engines equipped with the ECM 555 electronic control module. It is a direct-fit replacement for 5.0L, 5.7L, and 6.2L MPI engines with serial numbers ranging from 0M300000 through 2A455878.
This kit is a direct replacement for multiple OEM and aftermarket part numbers, ensuring wide compatibility with specified engines. It is designed to meet or exceed original equipment specifications for reliable performance.
- Installation Type: Direct replacement for a hassle-free installation.
- Ignition System: Specifically designed for the Delco HVS ignition system with a flat cap style connection.
- Quality Construction: Features a durable silicone and Kevlar core for maximum protection and performance.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury / Quicksilver | 84-863656A1, 863656A1 |
| Sierra | 18-8828-1 |
| Indmar | 756003, S756003 |
| REC | REC15-813 |
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 | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 350 MAG MPI Alpha/Bravo | 300 | 4-Stroke | 2001-Up | 84-863656A1 | For engines with s/n 0M300000-Up |
| MerCruiser | 350 MAG MPI Alpha/Bravo EC | 300 | 4-Stroke | 2001-Up | 84-863656A1 | For engines with s/n 1A300000-Up |
| MerCruiser | 350 MAG MPI Horizon Alpha/Bravo | 300 | 4-Stroke | 2001-2013 | 84-863656A1 | For engines with s/n 0M300000-1A299999 |
| MerCruiser | 350 MAG MPI Horizon Alpha/Bravo EC | 300 | 4-Stroke | 2001-Up | 84-863656A1 | For engines with s/n 1A300000-Up |
| MerCruiser | 350 MAG MPI Horizon MIE | 300 | 4-Stroke | 2001-2013 | 84-863656A1 | For engines with s/n 0M310000-1A089999 |
| MerCruiser | 350 MAG MPI MIE | 300 | 4-Stroke | 2001-2013 | 84-863656A1 | For engines with s/n 0M310000-1A089999 |
| MerCruiser | 350 MAG MPI SKI | 300 | 4-Stroke | 2001-2013 | 84-863656A1 | For engines with s/n 0M300000-1A089999 |
| MerCruiser | 357 HRZ Bobtail RM | 315 | 4-Stroke | 2001-Up | 84-863656A1 | ECM 555 ignition |
| MerCruiser | 377 MAG MPI Bravo | 320 | 4-Stroke | 2001-Up | 84-863656A1 | For engines with s/n 1A300000-Up |
| MerCruiser | 377 MAG MPI Bravo EC | 320 | 4-Stroke | 2001-Up | 84-863656A1 | For engines with s/n 1A343300-Up |
| MerCruiser | 383 MAG Stroker Bravo | 350 | 4-Stroke | 2001-Up | 84-863656A1 | ECM 555 ignition |
| MerCruiser | 383 MAG Stroker Inboard | 350 | 4-Stroke | 2001-Up | 84-863656A1 | ECM 555 ignition |
| MerCruiser | 385 Performance Tuned | 385 | 4-Stroke | 2001-Up | 84-863656A1 | ECM 555 ignition |
| MerCruiser | 5.0L MPI Alpha/Bravo | 260 | 4-Stroke | 2001-Up | 84-863656A1 | For engines with s/n 0M300000-Up |
| MerCruiser | 5.0L MPI Alpha/Bravo EC | 260 | 4-Stroke | 2001-Up | 84-863656A1 | For engines with s/n 1A300000-Up |
| MerCruiser | 5.7L MPI Horizon MIE | 350 | 4-Stroke | 2013-Up | 84-863656A1 | For engines with s/n 1A090000-Up |
| MerCruiser | 5.7L MPI MIE | 350 | 4-Stroke | 2013-Up | 84-863656A1 | For engines with s/n 1A090000-Up |
| MerCruiser | 5.7L MPI MIE EC | 350 | 4-Stroke | 2013-Up | 84-863656A1 | For engines with s/n 1A090000-Up |
| MerCruiser | 5.7L MPI SKI | 350 | 4-Stroke | 2013-Up | 84-863656A1 | For engines with s/n 1A090000-Up |
| MerCruiser | 5.7L MPI TOW | 350 | 4-Stroke | 2013-Up | 84-863656A1 | ECM 555 ignition |
| MerCruiser | 5.7L MPI Towsport with GEN III | 350 | 4-Stroke | 2013-Up | 84-863656A1 | For engines with s/n 1A091881-Up |
| MerCruiser | 5.7L SKI EC | 350 | 4-Stroke | 2013-Up | 84-863656A1 | For engines with s/n 1A090000-Up |
| MerCruiser | 6.2L MPI Horizon MIE | 320 | 4-Stroke | 2013-Up | 84-863656A1 | For engines with s/n 1A090000-Up |
| MerCruiser | 6.2L MPI MIE | 320 | 4-Stroke | 2013-Up | 84-863656A1 | For engines with s/n 1A090000-Up |
| MerCruiser | 6.2L MPI MIE EC | 320 | 4-Stroke | 2013-Up | 84-863656A1 | For engines with s/n 1A091600-Up |
| MerCruiser | MX 6.2L MPI Bravo | 320 | 4-Stroke | 2001-2013 | 84-863656A1 | For engines with s/n 0M300000-1A299999 |
| MerCruiser | MX 6.2L MPI Horizon Bravo | 320 | 4-Stroke | 2001-2013 | 84-863656A1 | For engines with s/n 0M300000-1A299999 |
| MerCruiser | MX 6.2L MPI Horizon MIE | 320 | 4-Stroke | 2001-2013 | 84-863656A1 | For engines with s/n 0M310000-1A089999 |
| MerCruiser | MX 6.2L MPI MIE | 320 | 4-Stroke | 2001-2013 | 84-863656A1 | For engines with s/n 0M310000-1A089999 |
| MerCruiser | MX 6.2L MPI SKI | 320 | 4-Stroke | 2001-2007 | 84-863656A1 | For engines with s/n 0M317000-0W689999 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Spark Plug Wire Set |
| Installation | Direct OEM replacement |
| Fuel Type | Gasoline |
| Housing Material | Silicone/Kevlar core with insulation |
| Connection | Flat cap style for ECM 555 ignition |
| Warranty | 1 year factory warranty (Mercury Marine/Quicksilver) |
| Other Technical Attributes | For use with Delco HVS ignition system |
Package Contents
- 1 x Spark Plug Wire Set (84-863656A1)
Installation Guide
- Safety First: Disconnect the boat's battery before beginning work.
- One by One: To avoid incorrect firing order, remove and replace only one spark plug wire at a time. Note the routing of the original wire.
- Distributor Cap End: Firmly press the new wire's boot onto the correct terminal of the distributor cap until you feel it click into place.
- Spark Plug End: Route the new wire to the corresponding spark plug and press the boot securely over the plug terminal.
- Repeat: Continue this process for all remaining wires.
- Final Check: Once all wires are replaced, ensure they are neatly routed and clear of hot or moving engine parts. Reconnect the battery and test the engine.
Troubleshooting & FAQ
Q: How do I confirm this fits my engine?
A: The most reliable way is to check your engine's serial number. This part fits MerCruiser 5.0L, 5.7L, and 6.2L MPI engines with serial numbers from 0M300000 to 2A455878. You can also compare your existing part number to the cross-reference list provided.
Q: What are common signs that my spark plug wires need replacing?
A: Symptoms of failing spark plug wires include engine misfires, a rough idle, poor acceleration, reduced fuel economy, and visible signs of wear, such as cracking or burning on the wire boots or insulation.
Q: How does this aftermarket set compare to the original OEM part?
A: This part is manufactured to meet or exceed original OEM specifications. It uses a high-quality silicone and Kevlar core for excellent heat resistance and durability, ensuring reliable spark delivery.
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.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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