{"product_id":"sierra-marine-ignition-switch-mp41040-4-position-conventional-15a-12v-black-knurled-face","title":"Sierra marine ignition switch MP41040 — 4-position conventional, 15A 12V, black knurled face","description":"\u003cp\u003e\u003cstrong\u003eThe Sierra MP41040 is a four-position conventional marine ignition switch designed as a universal-fit replacement for boats and high-horsepower engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt to withstand saltwater exposure and demanding engine environments, this Sierra ignition switch replaces many original equipment units while meeting or exceeding OE specifications. It offers a compact footprint, brass backup nut, knurled black plastic face nut, and screw-tab terminals engineered for reliable electrical connection at 15 amps and 12 VDC. The MP41040 is supplied by Sierra, a trusted OEM parts vendor, and is backed by the brand’s industry-leading warranty covering parts and many service-related costs.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this ignition switch fit my boat’s dashboard?\u003c\/h3\u003e\n\u003cp\u003eThe MP41040 is made as a universal-fit component to simplify replacements in a wide range of panels and dash layouts. With a 7\/8\" mounting hole requirement and a short shaft length that accommodates up to 1-1\/8\" panel thickness, it installs easily into most recreational and commercial craft.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMounting hole: 7\/8\" diameter\u003c\/li\u003e\n  \u003cli\u003eMaximum panel thickness: 1-1\/8\"\u003c\/li\u003e\n  \u003cli\u003eFace nut: knurled black plastic for secure hand tightening\u003c\/li\u003e\n  \u003cli\u003eBackup nut: brass for corrosion resistance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat electrical connections and ratings does the switch provide?\u003c\/h3\u003e\n\u003cp\u003eThis ignition switch uses four screw-tab terminals that accept standard wire sizes for marine electrical systems, making wiring straightforward for most installations. It is rated for 15 amps at 12 VDC, appropriate for typical ignition circuits and compatible accessories when installed per manufacturer guidance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTerminal type: 4 screw tab for reliable fastening\u003c\/li\u003e\n  \u003cli\u003eElectrical rating: 15 Amp @ 12 VDC\u003c\/li\u003e\n  \u003cli\u003eConventional 4-position operation for off, accessory, on, start configurations\u003c\/li\u003e\n  \u003cli\u003eDesigned for standard ignition wiring practices\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose Sierra MP41040 over other aftermarket switches?\u003c\/h3\u003e\n\u003cp\u003eSierra manufactures parts to satisfy the tougher demands of high-horsepower marine engines and corrosive environments, and this switch is no exception. The MP41040 is engineered to meet or exceed the original equipment it replaces, and Sierra supports it with a warranty that can cover shop labor, haul-out, towing fees, and related incidental charges when applicable.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMeets or exceeds original equipment specifications\u003c\/li\u003e\n  \u003cli\u003eMaterials: brass backup nut and durable plastic face nut for longevity\u003c\/li\u003e\n  \u003cli\u003eTrusted OEM supplier to many engine makers and boat builders\u003c\/li\u003e\n  \u003cli\u003eIndustry-leading warranty with specific service coverage details\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow difficult is installation and what do I need to know before buying?\u003c\/h3\u003e\n\u003cp\u003eInstallation is generally straightforward for anyone comfortable with basic dash wiring and panel work; the screw-tab terminals simplify electrical connections and the knurled face nut allows tool-free panel tightening in most cases. Confirm the 7\/8\" hole size and panel thickness compatibility before purchase and follow electrical safety practices, including disconnecting the battery and using proper wire gauges and connectors.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConfirm panel hole: 7\/8\" required\u003c\/li\u003e\n  \u003cli\u003eCheck panel thickness: up to 1-1\/8\" supported\u003c\/li\u003e\n  \u003cli\u003eUse correct wire gauge and clean screw-tab connections\u003c\/li\u003e\n  \u003cli\u003eDisconnect battery and follow marine electrical safety steps during install\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Sierra MP41040 ignition switch is ideal for boat owners, marine technicians, and DIY installers who need a reliable, corrosion-resistant replacement for a conventional four-position ignition. It suits a range of recreational and light commercial vessels, especially where OE-level durability and an OEM-grade warranty are priorities.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What hole size and panel thickness does the MP41040 require?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It fits a 7\/8\" mounting hole and supports panel thickness up to 1-1\/8\".\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What electrical rating and terminal type does this ignition switch have?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The switch is rated 15 Amp at 12 VDC and uses four screw-tab terminals.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":55167243977047,"sku":"B0000AXQN1","price":42.92,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/sierra-mp41040-front-panel-view.jpg?v=1790379879","url":"https:\/\/britishgarage.co.uk\/products\/sierra-marine-ignition-switch-mp41040-4-position-conventional-15a-12v-black-knurled-face","provider":"British Garage","version":"1.0","type":"link"}