HEI Ignition Coil For MerCruiser Thunderbolt IV & V - 392-7803A4, 392-805570A2

HEI Ignition Coil for MerCruiser Thunderbolt IV & V

This HEI ignition coil is a direct replacement for MerCruiser Thunderbolt IV & V ignition systems, featuring OEM cross-reference numbers 392-7803A4 and 392-805570A2 for reliable spark delivery in marine engines.

Overview

This HEI ignition coil is specifically designed for MerCruiser Thunderbolt IV & V applications, ensuring consistent ignition timing and dependable engine start-up. As a critical component, this HEI ignition coil helps maintain optimal performance on the water. Boat owners and mechanics rely on this HEI ignition coil for trouble-free operation.

Built For Performance

• High-energy output for reliable ignition under load
• Epoxy-filled design resists vibration and moisture
• Corrosion-resistant terminals for long service life
• Direct replacement for MerCruiser Thunderbolt IV & V systems
• Precision winding ensures consistent spark delivery
• Built to meet or exceed OEM specifications

On-The-Job Use

• Ideal for inboard and outboard marine engines using MerCruiser Thunderbolt IV or V ignition
• Commonly used in pleasure boats, fishing vessels, and cruisers
• Replaces failing ignition coils on older MerCruiser power plants
• Suitable for both fresh and saltwater applications
• Essential for routine maintenance of marine ignition systems

Specs At A Glance

Good To Know

Q: Is this ignition coil a direct replacement? A: Yes, it is designed to replace OEM coils for MerCruiser Thunderbolt IV & V systems without modifications.

Q: Can this coil be used in saltwater environments? A: Yes, its corrosion-resistant construction makes it suitable for both freshwater and saltwater use.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.