Mercury MerCruiser Spark Plug Wire Set

The Mercury MerCruiser 863656A1 Spark Plug Wire Set is a genuine Mercury Marine OEM ignition wire kit designed for V8 MPI sterndrive and inboard engines equipped with ECM 555 ignition systems. This complete ignition wire set delivers high-voltage current from the ignition system to each spark plug, ensuring reliable engine starting, smooth idle quality and consistent performance throughout the RPM range.

Manufactured to Mercury Marine specifications, these ignition leads feature marine-grade insulation and suppression technology to minimise electrical interference while providing maximum spark energy to the combustion chamber. The wires are designed to withstand the heat, vibration and moisture commonly encountered in marine engine compartments.

A worn or damaged spark plug wire set can cause misfires, hard starting, rough idle, reduced fuel economy and loss of engine performance. Replacing ignition leads at recommended service intervals helps maintain optimal engine efficiency and reliable operation.

The 863656A1 wire set is commonly used on MerCruiser 5.0L MPI, 5.7L MPI, 350 MAG MPI, MX 6.2L MPI and other GM-based V8 MPI engines equipped with ECM 555 engine management systems. Genuine Mercury components ensure proper wire length, correct terminal fitment and OEM performance.

Features:

• Genuine Mercury Marine OEM part
• Complete V8 spark plug wire set
• Marine-grade ignition lead construction
• EMI/RFI suppression technology
• Heat and moisture resistant insulation
• OEM fit and performance
• Designed for MPI ignition systems