Sierra 118-5810 Starter Solenoid for Mercury Outboard and MerCruiser

The Sierra 118-5810 is a heavy-duty starter solenoid engineered specifically for marine applications. This horizontal post solenoid serves as a critical electrical component that activates the starter motor circuit when the ignition key is turned, transferring high current from the battery to the starter motor while protecting low-current switch circuits.

Key Features:

• Horizontal post terminal configuration for easy installation
• 12-volt electrical system compatibility
• Marine-grade construction designed to resist saltwater and corrosion
• Insulated base with 1/4-20 threaded battery and motor terminals
• Four-terminal design with 8-32 threaded ground and switch terminals
• Copper contact material for reliable electrical conductivity
• Meets or exceeds OEM specifications for quality and performance

This solenoid is designed for Mercury and Mariner outboard engines ranging from 45 to 300 horsepower, as well as MerCruiser sterndrive applications. Sierra replacement parts are manufactured to withstand the harsh marine environment with superior corrosion resistance and durability compared to standard automotive solenoids. The rugged construction ensures reliable engine starting performance season after season.