Sierra Ignition Switches

When marine reliability meets precision engineering, Sierra stands as a trusted name for boaters who demand uncompromising performance from their electrical systems. Sierra's ignition switches represent decades of marine-specific expertise, delivering the robust construction and corrosion resistance required in harsh saltwater environments.

Marine-Grade Engineering Excellence

Sierra's ignition switches feature marine-grade glass-filled polyester construction that provides maximum corrosion protection and eliminates oxidation—critical advantages when electrical components face constant exposure to moisture, salt spray, and temperature extremes. The switches provide maximum corrosion protection with non-conductive housing that eliminates potential shorts, and feature an inner seal between the cylinder lock and contact plate for enhanced durability and longevity.

OEM-Quality Replacement Solutions

All Sierra products meet or exceed the original equipment part it replaces, making these ignition switches ideal for both routine maintenance and critical repairs. Sierra supplies many OEM engine manufacturers and boat builders hundreds of quality parts every day, providing the same reliability you'd expect from factory components. Whether you're replacing a worn switch on an outboard, inboard, or sterndrive application, Sierra offers multiple configurations including 3-position conventional and magneto designs to match your vessel's specific electrical architecture.

Comprehensive Product Range

Sierra's ignition switch lineup includes popular models like the MP41000, MP39760, MP39770, and MP41030, each engineered for specific panel thickness requirements and terminal configurations. Available in both screw tab and blade terminal variants, these switches accommodate panel thicknesses ranging from 5/8 inch to 1 1/8 inches. Standard ratings include 15 Amp at 12v DC for ignition circuits and 30 Amp at 12v DC for solenoid applications, with magneto models offering additional choke circuit capability rated at 7 Amp.

Built for the Marine Environment

Unlike automotive ignition switches that may fail prematurely in marine applications, Sierra designs every component specifically for the demanding conditions found on the water. The brass hardware, hex chrome face nuts, and sealed construction resist the corrosive effects of salt and humidity while maintaining reliable electrical contact season after season. For marine professionals and recreational boaters alike, Sierra ignition switches deliver the dependability needed to keep vessels running when it matters most.