Sierra 118-5438 Marine Ignition Coil for MerCruiser Thunderbolt HEI V6 V8

The Sierra 118-5438 ignition coil is a premium aftermarket replacement component designed for marine engines equipped with HEI (High Energy Ignition) Thunderbolt IV and V ignition systems. This critical component transforms battery voltage into the high-voltage electrical pulse needed to fire the spark plugs, enabling reliable engine operation.

Key Features:

• Designed for GM V-6 and V-8 marine engines with HEI Thunderbolt IV and V ignition systems
• Generates up to 40,000 volts for reliable spark delivery
• Manufactured to meet or exceed OEM specifications
• Direct replacement for original equipment
• Backed by Sierra's 50+ years of marine industry expertise

OEM Cross-References:

• Mercury Marine: 392-7803A4, 392-805570A2, 8M0079202, 300-8M0079202
• MerCruiser: 392-7803A4, 392-805570A2
• Crusader: 37068
• GLM: 118-5438
• CDI Marine: E18-0008
• Mallory: 9-29701

This ignition coil is essential for maintaining peak engine performance and ensuring dependable starts. When your ignition coil fails, your engine cannot run, making this a vital component for marine engine maintenance and repair.