Sierra Ignition Switches
Sierra MP41010 Marine Ignition Starter Switch 4 Position 7 Screw Terminal 12V 15A
Sierra MP39730 Magneto Ignition Starter Switch 4 Position 7 Screw Terminal 12V 15 Amp
Sierra MP39200 3-Position Ignition Starter Switch 12V 15A with Polyester Housing
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Sierra Ignition Switches: Reliable Starts on the Water
When it comes to keeping your boat's engine firing reliably, few components are as critical as the ignition switch. Sierra has spent nearly six decades earning the trust of boaters, marine technicians, and OEM boat builders alike — and their lineup of ignition switches reflects that same commitment to precision and durability.
Why Sierra Stands Out in Marine Ignition Switches
Unlike generic automotive switches, Sierra ignition switches are purpose-built for the punishing marine environment. Marine-grade glass-filled polyester construction gives these switches maximum corrosion protection and helps eliminate oxidation — a critical feature for any component mounted on a boat's helm panel and exposed to salt air, humidity, and moisture year-round.
Sierra's parent company, Dometic, operates an ISO 9001:2015 certified facility in Litchfield, Illinois, where all Sierra products are designed and quality-tested. Every ignition switch in Sierra's lineup is engineered to meet or exceed the OEM specification of the part it replaces — meaning fit, function, and longevity are all held to factory standards.
A Switch for Every Application
Sierra offers a well-rounded selection of ignition switch configurations to cover a wide range of inboard, outboard, and sterndrive applications:
- MP41000 – 3-position Off-Run-Start with Push-to-Choke function, a go-to replacement for conventional ignition outboards including Mercury applications.
- MP41030 – A clean 3-position Off-Run-Start switch for standard ignition setups.
- MP41040 – A 4-position switch designed to fit and replace ignition systems on tournament inboard ski and wakeboard boats, with broad compatibility across brands such as Malibu, Mastercraft, Supra, and Moomba.
- MP52000 – A direct OEM-replacement Mercury ignition switch rated for DFI, EFI, and MPI engines — ideal for modern high-performance powerplants.
- MP39090 / MP39760 – 3-position magneto switches delivering maximum corrosion resistance, available in 12-volt, 30-amp configurations for outboard setups.
Most Sierra ignition switches are designed for a standard 7/8-inch panel hole and accept panels up to 1-1/8 inches thick, making installation straightforward for DIY boaters and marine service technicians alike. Exact-fit design minimizes labor time and eliminates the guesswork that comes with universal-fit alternatives.
OEM Heritage, Aftermarket Availability
Sierra has long been recognized as one of the marine industry's leading suppliers of switching products, and their ignition switch catalog is one of the most referenced in the aftermarket space. With cross-references to Mercury Marine, OMC, Volvo Penta, MerCruiser, and numerous boat builders, finding the right Sierra switch for your vessel is straightforward using Sierra's own parts catalog tool or OEM part number lookups.
Whether you're refitting an older outboard or replacing a failed switch on a modern inboard, Sierra's ignition switches deliver the dependability the brand has built its reputation on. Explore the full range of ignition switches or browse all Sierra marine products to find everything you need to keep your vessel running at its best.
