Description

Mercury / MerCruiser Quicksilver Ignition Wire Kit — 816761Q3

The Mercury Quicksilver 816761Q3 Ignition Wire Kit is a genuine OEM spark plug wire set designed for MerCruiser V8 gasoline engines equipped with Thunderbolt ignition systems. The wires deliver high-voltage current from the ignition coil and distributor to the spark plugs to ensure proper ignition timing and engine performance.

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Key Specifications

• Part Number: 816761Q3

• Mercury Format: 84-816761Q3

• Component Type: Spark plug ignition wire set

• Ignition System: Thunderbolt IV

• OEM Brand: Mercury Marine / Quicksilver

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Compatible Engines / Applications

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

• 305 CID V8 (5.0L)

• 350 CID V8 (5.7L)

Typically used on right-hand rotation MerCruiser engines with Thunderbolt IV ignition systems produced approximately 1981–1993.

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Function

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

• Reliable engine starting

• Smooth idle and acceleration

• Consistent spark delivery to all cylinders

Each wire is manufactured to OEM specifications with marine-grade insulation designed 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 helps restore proper ignition performance and spark delivery.

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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 the engine family, rotation direction, and ignition system installed.

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: 816761Q3