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

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

18-5777-1
06/02/2036 12:55 PM
Sale Price

$169.06

In Stock (10+)

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Usually delivered within 2 days

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Product Details

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.

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