Description

Mercury / MerCruiser Quicksilver Ignition Wire Kit — 816761Q17

The Mercury Quicksilver 816761Q17 Ignition Wire Kit is a genuine OEM spark plug wire set designed for MerCruiser V8 gasoline engines equipped with Thunderbolt ignition systems. It transfers high-voltage ignition current from the distributor and coil to the spark plugs, ensuring proper spark delivery and reliable engine performance.

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Key Specifications

• Part Number: 816761Q17

• Mercury Format: 84-816761Q17

• Component Type: Spark plug ignition wire set

• Ignition System: Thunderbolt IV / Thunderbolt V

• OEM Brand: Mercury Marine / Quicksilver

• Kit Contents: Complete set of spark plug wires with molded plug boots

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Compatible Engines / Applications

Commonly used on MerCruiser GM-based V8 engines, including:

• 5.0L V8 (305 CID)

• 5.7L V8 (350 CID)

Typically installed on left-hand rotation MerCruiser engines equipped with Thunderbolt IV or V ignition systems, generally produced 1993–2003.

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Function

The ignition wire kit carries high-voltage spark energy from the ignition coil and distributor to each spark plug in the correct firing order. Properly functioning ignition wires help provide:

• Reliable engine starting

• Smooth idle and acceleration

• Consistent spark delivery to all cylinders

The wires are built with marine-grade insulation to withstand heat, vibration, and moisture common in marine engine compartments.

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Symptoms of Worn Ignition Wires

A deteriorated ignition wire set may cause:

• Engine misfires

• Hard starting

• Rough idle or hesitation

• Reduced engine performance

Replacing the ignition wire kit restores proper spark delivery and ignition performance.

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Fitment Tip:
Always verify compatibility using the engine model and serial number. MerCruiser engines may use different ignition wire sets depending on engine rotation direction, ignition system version, and production year.

OEM parts ship same or next day for fast Canada wide shipping.

Technical Specifications:

• Type: Ignition wire kit
• Compatible with: Mercury MerCruiser marine engines
• Part Number: 816761Q17