Sierra 118-99230 Ignition Pack for Mercury Outboard Engines

The Sierra 118-99230 is a high-performance replacement ignition pack (switchbox) designed for Mercury and Mariner outboard engines. This critical ignition component controls the timing and delivery of spark to the engine's cylinders, ensuring reliable starting and optimal engine performance.

Key Features:

• Premium aftermarket replacement engineered to meet or exceed OEM specifications
• Precision-built CDI (Capacitor Discharge Ignition) module for consistent spark delivery
• Factory-tested for reliable performance and long service life
• Direct replacement for Mercury OEM part number 18-99230
• Professional installation by a qualified marine mechanic recommended

Sierra is a trusted manufacturer of marine engine parts, providing quality aftermarket replacements backed by rigorous testing. This ignition pack helps maintain proper engine timing and ensures dependable operation across all operating conditions. When replacing a faulty switchbox, it is often recommended to replace both units as a set on multi-cylinder engines to prevent cascading failures.