Quicksilver Ignition Coil for MerCruiser V6/V8 — 8M0079202 Thunderbolt IV/V Direct-Fit OEM Replacement

Quicksilver 8M0079202 is a direct-fit ignition coil built to meet Mercury Marine OEM specifications for select V6 and V8 MerCruiser sterndrive and inboard engines equipped with Thunderbolt IV and V ignition systems.

This ignition coil is designed as a replacement part for MerCruiser-powered boats using the Thunderbolt IV or V ignition platforms. Manufactured under the Quicksilver brand, the unit is produced to align with factory tolerances and electrical requirements so it integrates with original wiring and mounting arrangements. Always confirm fitment against your engine service or parts manual before ordering to ensure compatibility with your specific model year and configuration.

Which engines and ignition systems does this coil support?

The 8M0079202 coil is specified for select General Motors–based MerCruiser V6 and V8 sterndrive and inboard engines that use Thunderbolt IV or Thunderbolt V ignition systems. It replaces coils designed for those exact ignition platforms and follows factory electrical specs for reliable operation.

• Intended for MerCruiser V6 and V8 engines built on GM platforms.
• Compatible with Thunderbolt IV and Thunderbolt V ignition modules.
• Matches Mercury Marine original equipment electrical characteristics.

How does this replacement coil affect engine performance and reliability?

As a coil manufactured to OEM standards, it helps restore correct spark energy and timing characteristics expected by the engine management system. Replacing a worn or damaged coil can reduce misfires, restore smooth idle, and improve throttle response when the ignition is the root cause.

• Provides specified secondary voltage and dwell properties for Thunderbolt systems.
• Helps eliminate intermittent spark faults from aging coils.
• Designed to fit and mount like the original component for straightforward replacement.

What should I check before buying and installing this part?

Confirm the part number and cross-reference it with your engine’s parts list or service manual; many MerCruiser models use similar-looking coils but different internal specs. Inspect the ignition wiring, connectors, and mounting hardware for corrosion or damage before installation to ensure the new coil operates correctly.

• Verify 8M0079202 matches the part number in your service manual.
• Check wiring harness condition and connector pins for corrosion.
• Replace mounting bolts and insulators if worn to secure proper grounding.

Is this coil easy to install and maintain?

Installation is typically straightforward for those familiar with marine engine ignition components: the coil mounts in the factory location and connects to the existing harness and spark leads. Routine maintenance is limited to visual inspection of connectors and ensuring a clean, dry mounting location free from oil and excessive heat.

• Direct-fit replacement with original mounting points and connector compatibility.
• No special tools beyond basic hand tools usually required.
• Maintenance involves periodic connector checks and cleaning if necessary.

Who this product is for: Marine owners, mechanics, and service shops that maintain MerCruiser sterndrive or inboard engines on GM platforms and require a factory-spec ignition coil for Thunderbolt IV or V systems. It's especially useful when ignition misfires or coil failure is suspected and a like-for-like OEM-quality replacement is preferred to preserve engine operation and diagnostics compatibility.