Sierra 18-8804-1 MerCruiser V8 Thunderbolt Spark Plug Wire Set

The Sierra 18-8804-1 is a premium marine spark plug wire set engineered for MerCruiser V8 engines equipped with Thunderbolt electronic ignition systems. This complete wire set is designed to deliver maximum voltage to spark plugs while protecting sensitive marine electronics from radio-frequency and electromagnetic interference.

Key Features:

• Complete set includes coil wire for easy installation
• Kevlar core construction provides maximum durability and extended service life
• Stainless steel wound conductor ensures maximum horsepower and optimal engine performance
• Premium silicone jacketing and boots withstand temperatures up to 500°F
• Superior RFI suppression protects electronic systems and engine controls
• Corrosion-resistant stainless steel terminals with snap-lock design for reliable connectivity
• 8mm diameter wire for high-performance applications

This Sierra MAGFORCE ignition wire set features an exact-fit design that ensures straightforward installation and years of trouble-free operation. The high-tear-strength silicone jacket combined with reinforcing mesh increases tensile strength while the unique magnetic wire conductor delivers consistently hot spark for improved engine efficiency and fuel economy.

Replaces OEM Numbers: Mercury Marine 84-813720A2, 84-813720A3, 84-813720A4, 84-816761A4, 84-816761Q3, 84-816761Q4, 84-816608Q61; Mallory 9-28001, 9-28002