{"product_id":"sierra-mp39770-conventional-3-position-1-1-8-polyester-3-blade-terminal-12-15-amp-ignition-starter-switch-11-mp39770","title":"Sierra MP39770 Marine Ignition Starter Switch – 3-Position, Conventional, 12V\/15A","description":"\u003ch2\u003eSierra MP39770 Marine Ignition Starter Switch – 3-Position Conventional, 12V\/15A\u003c\/h2\u003e\u003cp\u003eThe Sierra MP39770 is a heavy-duty marine ignition starter switch built for conventional ignition systems on outboard and inboard engines. The 3-position action — Off, Ignition, and Start — delivers clean, positive control over engine startup and shutdown from the helm. A corrosion-resistant polyester housing with an inner cylinder seal keeps moisture out and eliminates the risk of shorts, making it well-suited for saltwater and high-humidity marine environments.\u003c\/p\u003e\u003cp\u003eThe 1-1\/8\" cylinder diameter and 7\/8\" mounting hole fit a wide range of marine dash panels. The 3-blade terminal layout is designed for conventional ignition wiring, and the included boot provides a finished, weather-resistant installation. Note: this switch does not include a push-to-choke function.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart Number: 11-MP39770\u003c\/li\u003e\n\u003cli\u003eSwitch Type: 3-Position (Off – Ignition – Start)\u003c\/li\u003e\n\u003cli\u003eIgnition Type: Conventional\u003c\/li\u003e\n\u003cli\u003eVoltage: 12V DC\u003c\/li\u003e\n\u003cli\u003eCurrent Rating: 15A\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: 3 Blade\u003c\/li\u003e\n\u003cli\u003eHousing Material: Polyester (corrosion-resistant)\u003c\/li\u003e\n\u003cli\u003eIncludes: Boot, lock and contact plate\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 conventional ignition systems\u003c\/li\u003e\n\u003cli\u003eMarine helm panels with a 7\/8\" mounting hole accepting a 1-1\/8\" cylinder switch\u003c\/li\u003e\n\u003cli\u003e12V DC electrical systems requiring a 3-position Off\/Ignition\/Start switch\u003c\/li\u003e\n\u003cli\u003eReplacement for worn or damaged OEM ignition switches on conventional-ignition engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe MP39770 is the right choice when your engine runs a conventional ignition system and you need a 1-1\/8\" cylinder switch without a push-to-choke — common on many modern outboards and inboards where choke is handled electronically or separately. The 3-blade terminal layout is the key differentiator from screw-terminal switches in this family. If your engine uses a magneto ignition instead, the \u003ca href=\"\/products\/sierra-mp39760-marine-ignition-starter-switch-3-position-magneto-12v-15a\"\u003eSierra MP39760 Magneto Ignition Switch\u003c\/a\u003e is the correct fit, and includes push-to-choke. For a magneto application with a 5-screw terminal layout, the \u003ca href=\"\/products\/sierra-mp39100-magneto-3-position-11-8-polyester-5-screw-terminal-12v-15-amp-ignition-starter-switch\"\u003eSierra MP39100 Polyester 5-Screw Ignition Switch\u003c\/a\u003e covers that configuration. If a brass-bodied switch is preferred, the \u003ca href=\"\/products\/sierra-mp39040-magneto-3-position-1-1-8-brass-5-screw-terminal-12v-10-amp-ignition-starter-switch\"\u003eSierra MP39040 Brass Ignition Switch\u003c\/a\u003e is available, though rated at 10A.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250881364004,"sku":"11-MP39770","price":49.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/11-MP39770.jpg?v=1786511559","url":"https:\/\/marisolmarine.com\/products\/sierra-mp39770-conventional-3-position-1-1-8-polyester-3-blade-terminal-12-15-amp-ignition-starter-switch-11-mp39770","provider":"Marisol Marine Company","version":"1.0","type":"link"}