Mercury MerCruiser Spark Plug Wire Set 863656A1
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Mercury / MerCruiser Quicksilver Spark Plug Wire Set ā 863656A1
The Mercury Quicksilver 863656A1 Spark Plug Wire Set is a genuine OEM ignition wire kit designed for MerCruiser V8 MPI sterndrive and inboard engines equipped with ECM-controlled ignition systems. The set delivers high-voltage current from the ignition coil and distributor to the spark plugs, ensuring reliable ignition and smooth engine performance.
Key Specifications
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Part Number: 863656A1
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Mercury Format: 84-863656A1
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Component Type: Spark plug ignition wire set
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Includes: 8 spark plug wires + 1 ignition coil wire
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OEM Brand: Mercury Marine / Quicksilver
Compatible Engines / Applications
Commonly used on MerCruiser V8 MPI gasoline engines with ECM-controlled ignition, including:
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5.0L MPI (305 CID)
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5.7L MPI / 350 MAG
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6.2L MPI
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377 MAG MPI
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383 MAG Stroker
Typically used on MerCruiser sterndrive and inboard engines from approximately 2001ā2015 with ECM 555 ignition systems.
Function
The spark plug wire set transfers high-voltage ignition energy from the ignition coil and distributor to each spark plug in the correct firing order. Properly functioning wires ensure:
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Strong and consistent spark delivery
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Smooth engine starting and idle
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Reliable engine performance under load
The wires are manufactured with marine-grade insulation to withstand heat, vibration, and moisture common in marine engine environments.
Symptoms of Worn Spark Plug Wires
A worn or damaged wire set may cause:
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Engine misfires
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Rough idle or hesitation
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Hard starting
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Poor fuel economy
Replacing the wire set helps restore proper ignition performance.
ā ļø Fitment Tip:
Always verify compatibility using the engine model and serial number. MerCruiser MPI engines may use different ignition wire sets depending on the ignition system and distributor style installed.
OEM parts ship same or next day for fast Canada wide shipping.
Technical Specifications:
- Type: Spark plug wire set
- Compatible with: Mercury MerCruiser marine engines
- Part Number: 863656A1
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3ā4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us ā and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity ā and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.