{"product_id":"sierra-mp39040-magneto-3-position-1-1-8-brass-5-screw-terminal-12v-10-amp-ignition-starter-switch-11-mp39040","title":"Sierra MP39040 Marine Ignition Starter Switch – 3-Position, Magneto, Brass, 12V\/10A","description":"\u003ch2\u003eSierra MP39040 Marine Ignition Starter Switch – 3-Position Magneto, Brass, 12V\/10A\u003c\/h2\u003e\u003cp\u003eThe Sierra MP39040 is a traditional brass-bodied marine ignition starter switch built for magneto ignition systems. Solid brass construction delivers time-tested corrosion resistance with a premium look and feel that suits classic and vintage marine helm panels. The 3-position action — Off, Ignition, and Start — provides clean, positive control over engine startup and shutdown, backed by a 30A solenoid rating.\u003c\/p\u003e\u003cp\u003eThe 1-1\/8\" cylinder diameter and 7\/8\" mounting hole fit a wide range of marine dash panels, and the included boot provides a finished, weather-resistant installation. The 5-screw terminal layout accommodates standard magneto ignition wiring. Note: this switch does not include a push-to-choke function, and is rated at 10A — verify your circuit load before installation.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart Number: 11-MP39040\u003c\/li\u003e\n\u003cli\u003eSwitch Type: 3-Position (Off – Ignition – Start)\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Magneto\u003c\/li\u003e\n\u003cli\u003eVoltage: 12V DC\u003c\/li\u003e\n\u003cli\u003eCurrent Rating: 10A\u003c\/li\u003e\n\u003cli\u003eSolenoid: 30A\u003c\/li\u003e\n\u003cli\u003eCylinder Diameter: 1-1\/8\"\u003c\/li\u003e\n\u003cli\u003eMounting Hole: 7\/8\"\u003c\/li\u003e\n\u003cli\u003eTerminals: 5 Screw\u003c\/li\u003e\n\u003cli\u003eHousing Material: Brass (traditional corrosion-resistant construction)\u003c\/li\u003e\n\u003cli\u003eIncludes: Boot\u003c\/li\u003e\n\u003cli\u003ePush-to-Choke: Not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutboard and inboard engines with magneto ignition systems\u003c\/li\u003e\n\u003cli\u003eClassic, vintage, and traditional-style marine helm panels\u003c\/li\u003e\n\u003cli\u003eMarine dash panels with a 7\/8\" mounting hole accepting a 1-1\/8\" cylinder switch\u003c\/li\u003e\n\u003cli\u003e12V DC circuits with loads at or below 10A\u003c\/li\u003e\n\u003cli\u003eDirect replacement for worn or damaged OEM brass ignition switches on magneto-equipped engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe MP39040 is the right choice when you want a brass-bodied switch for a classic or vintage helm, or when you're matching an existing brass switch on the panel. The traditional brass construction is its defining feature — but note the 10A current rating, which is lower than the polyester alternatives in this family. If your circuit load exceeds 10A or you need push-to-choke, the \u003ca href=\"\/products\/sierra-mp39760-marine-ignition-starter-switch-3-position-magneto-12v-15a\"\u003eSierra MP39760 Magneto Polyester Switch\u003c\/a\u003e is the higher-rated (15A) alternative with push-to-choke included. For a magneto switch with a 5-screw terminal layout in polyester at 15A, the \u003ca href=\"\/products\/sierra-mp39100-magneto-3-position-11-8-polyester-5-screw-terminal-12v-15-amp-ignition-starter-switch\"\u003eSierra MP39100 Polyester Ignition Switch\u003c\/a\u003e is the direct upgrade. If your engine runs a conventional ignition rather than magneto, the \u003ca href=\"\/products\/sierra-mp39770-marine-ignition-starter-switch-3-position-conventional-12v-15a\"\u003eSierra MP39770 Conventional Ignition Switch\u003c\/a\u003e is the correct fit.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250881462308,"sku":"11-MP39040","price":84.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/11-MP39040.jpg?v=1786511561","url":"https:\/\/marisolmarine.com\/products\/sierra-mp39040-magneto-3-position-1-1-8-brass-5-screw-terminal-12v-10-amp-ignition-starter-switch-11-mp39040","provider":"Marisol Marine Company","version":"1.0","type":"link"}