Sierra 18-5777-1 Switch Box for Mercury Mariner Outboard Motors

The Sierra 18-5777-1 switch box is a high-quality ignition component designed specifically for Mercury and Mariner outboard engines. This aftermarket replacement part delivers reliable spark control and engine performance for small to mid-range outboard applications.

Key Features:

• Direct replacement for Mercury OEM part numbers 339-7452A7, 339-7452A9, 339-7452A11, 339-7452A14, 339-7452A15, 339-7452A19, and 339-7452A21
• Also replaces CDI 114-7452K1 and Mallory 9-25102, 9-25103
• Meets or exceeds original equipment specifications
• Engineered for reliable ignition performance in marine environments
• Compatible with multiple Mercury and Mariner outboard models from 6 HP to 25 HP

Application Range: Fits Mercury/Mariner 6 HP (S/N A197112-Up), 8 HP (S/N A197112-Up), 9.9 HP (S/N A197112-Up), 15 HP (S/N B292414-Up), 20 HP (S/N B238464-G760299), 25 HP (S/N B238464-G760299), and 210CC Sail Power (S/N A918999-Up).

Sierra is a trusted name in marine aftermarket parts, providing quality replacement components for outboard and stern drive engines. This switch box is manufactured to OEM standards and backed by Sierra's warranty for reliable performance.

Note: Switch box color may vary (blue or black). Always verify part number compatibility with your specific engine model and serial number before ordering.