{"product_id":"sierra-mp39800-conventional-4-position-1-1-8-polyester-4-blade-terminal-12v-15-amp-ignition-starter-switch-11-mp39800","title":"Sierra MP39800 Marine Ignition Starter Switch – 4-Position, Conventional, 12V\/15A","description":"\u003ch2\u003eSierra MP39800 Marine Ignition Starter Switch – 4-Position Conventional, 12V\/15A\u003c\/h2\u003e\u003cp\u003eThe Sierra MP39800 is a heavy-duty marine ignition starter switch built for conventional ignition systems that require an Accessory position. The 4-position action — Accessory, Off, Ignition, and Start — lets you power onboard electronics independently before engaging the ignition, a feature increasingly common on modern helm setups with chartplotters, VHF radios, and stereo systems. A corrosion-resistant polyester housing with an inner seal between the cylinder lock and contact plate keeps moisture out and prevents shorts in demanding 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 4-blade terminal layout suits conventional ignition wiring with an accessory circuit. Note: this switch does not include a push-to-choke function or a boot.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart Number: 11-MP39800\u003c\/li\u003e\n\u003cli\u003eSwitch Type: 4-Position (Accessory – 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: 4 Blade\u003c\/li\u003e\n\u003cli\u003eHousing Material: Polyester (corrosion-resistant)\u003c\/li\u003e\n\u003cli\u003ePush-to-Choke: Not included\u003c\/li\u003e\n\u003cli\u003eBoot: 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 requiring an Accessory position\u003c\/li\u003e\n\u003cli\u003eMarine helm panels with chartplotters, VHF radios, or stereo systems needing independent accessory power\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 electrical systems requiring a 4-position Accessory\/Off\/Ignition\/Start switch\u003c\/li\u003e\n\u003cli\u003eDirect replacement for worn or damaged OEM 4-position ignition switches on conventional-ignition engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe MP39800 is the right choice when your helm has electronics — a chartplotter, VHF, or stereo — that you want to power up before cranking the engine. The Accessory position is the key upgrade over a standard 3-position switch. If you only need Off\/Ignition\/Start without an Accessory position, the \u003ca href=\"\/products\/sierra-mp39770-marine-ignition-starter-switch-3-position-conventional-12v-15a\"\u003eSierra MP39770 3-Position Conventional Switch\u003c\/a\u003e (with boot) or the compact \u003ca href=\"\/products\/sierra-mp39780-marine-ignition-starter-switch-3-position-conventional-compact-5-8\"\u003eSierra MP39780 3-Position Compact Switch\u003c\/a\u003e are the simpler alternatives. For a 4-position switch in a smaller 5\/8\" cylinder format, the \u003ca href=\"\/products\/sierra-un12140-conventional-4-position-5-8-zinc-4-stud-terminal-12v-15-amp-ignition-starter-switch\"\u003eSierra UN12140 Compact 4-Position Switch\u003c\/a\u003e covers that application. If you need a 4-position switch with screw terminals rather than blade terminals, the \u003ca href=\"\/products\/sierra-mp41040-conventional-4-position-1-1-8-polyester-4-screw-terminal-12v-15-amp-ignition-starter-switch\"\u003eSierra MP41040 4-Screw Terminal Switch\u003c\/a\u003e is the direct alternative in the same 1-1\/8\" format.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250881429540,"sku":"11-MP39800","price":50.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/11-MP39800.jpg?v=1786511561","url":"https:\/\/marisolmarine.com\/products\/sierra-mp39800-conventional-4-position-1-1-8-polyester-4-blade-terminal-12v-15-amp-ignition-starter-switch-11-mp39800","provider":"Marisol Marine Company","version":"1.0","type":"link"}