Mercury MerCruiser Distributor Cap Assembly

The Mercury Marine 805759T1 Distributor Cap Assembly is a genuine Mercury OEM ignition system component designed for GM-based V8 MerCruiser sterndrive and inboard engines equipped with Thunderbolt IV and Thunderbolt V HEI ignition systems. The distributor cap is responsible for routing high-voltage current from the ignition coil to the correct spark plug lead, ensuring accurate ignition timing, reliable starting and smooth engine operation.

Manufactured to Mercury Marine specifications, the distributor cap features corrosion-resistant terminals and marine-grade construction designed to withstand the heat, vibration and moisture commonly found in marine engine compartments. Genuine Mercury ignition components help maintain consistent spark delivery and optimum engine performance.

A worn, cracked or corroded distributor cap can lead to ignition misfires, rough idle, hard starting, poor fuel economy, reduced power and intermittent engine performance issues. Replacing the distributor cap as part of routine ignition maintenance helps ensure dependable operation and maximum engine efficiency.

The 805759T1 cap assembly is commonly used on MerCruiser 5.0L, 5.7L, 350 MAG, 454 MAG, 502 MAG and other GM V8 marine engines fitted with Thunderbolt IV or Thunderbolt V HEI distributor ignition systems.

This part is supplied as a complete distributor cap assembly and is designed for direct OEM replacement and fitment.

This is the current Mercury replacement part for many earlier Thunderbolt distributor cap applications.