{"product_id":"sierra-bayliner-marine-ignition-switch-mp39780-short-profile-3-position-corrosion-resistant-15a-30a","title":"Sierra Bayliner Marine Ignition Switch MP39780 — Short-Profile 3-Position, Corrosion-Resistant 15A\/30A","description":"\u003cp\u003e\u003cstrong\u003eThe Sierra MP39780 Bayliner marine ignition switch is a compact, corrosion-resistant 3-position replacement switch rated for 15A ignition and 30A solenoid at 12V, built to fit a 7\/8\" panel hole and short panel thicknesses up to 5\/8\".\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis ignition switch is designed for Bayliner and other boats that need a reliable, direct-replacement control for starting and accessory power. Molded from marine-grade glass-filled polyester with internal sealing and brass hardware, it resists corrosion and electrical shorts while offering standard 3-screw tab connections for straightforward wiring. Its short-profile design suits consoles or dash panels with limited depth.\u003c\/p\u003e\n\n\u003ch3\u003eWill this ignition switch fit my Bayliner dash or panel?\u003c\/h3\u003e\n\u003cp\u003eThe switch fits panels drilled for a 7\/8\" hole and accepts a maximum panel thickness of 5\/8\" due to its short-length design. Confirm your panel's hole diameter and thickness before ordering to ensure a correct fit.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHole size: 7\/8\" (standard Bayliner dash opening)\u003c\/li\u003e\n  \u003cli\u003eMaximum panel thickness: 5\/8\" (short profile version)\u003c\/li\u003e\n  \u003cli\u003eFace nut: hex black plastic for a secure, trimmed finish\u003c\/li\u003e\n  \u003cli\u003eBack up nut: brass for corrosion-resistant fastening\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable is the switch in saltwater and humid conditions?\u003c\/h3\u003e\n\u003cp\u003eThis model uses marine-grade glass-filled polyester housing and an inner seal between the cylinder and contact plate to minimize moisture ingress. Non-conductive housing reduces the risk of shorts and brass fastening components resist rust, making it suitable for typical recreational boating environments.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMaterial: marine-grade glass-filled polyester for strength and weather resistance\u003c\/li\u003e\n  \u003cli\u003eInner seal: prevents corrosion at the lock-contact interface\u003c\/li\u003e\n  \u003cli\u003eBack up nut brass: improves long-term corrosion protection\u003c\/li\u003e\n  \u003cli\u003eNon-conductive housing: reduces electrical short potential\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat electrical ratings and terminal type does it use?\u003c\/h3\u003e\n\u003cp\u003eThe switch provides a rated ignition circuit of 15 amps at 12 volts DC and a 30-amp solenoid rating at 12 volts DC, matching many small-boat starting systems. It uses three screw-tab terminals so you can connect standard wiring harnesses without crimp-only terminals.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIgnition rating: 15 Amp @ 12V DC\u003c\/li\u003e\n  \u003cli\u003eSolenoid rating: 30 Amp @ 12V DC\u003c\/li\u003e\n  \u003cli\u003eTerminal type: 3 screw tab for secure wiring\u003c\/li\u003e\n  \u003cli\u003eType: 3-position conventional (OFF\/ACCESSORY\/START style operation)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this switch for? The Sierra MP39780 is aimed at boat owners, marine technicians, and DIYers needing a compact, corrosion-conscious replacement ignition switch for Bayliner boats or other vessels using the same mounting and electrical specs. If you require a short-profile unit with sealed internals, brass backup nut, and non-conductive housing to reduce shorts, this switch is a practical, cost-effective option. Always verify hole size, panel thickness, and amperage compatibility with your vessel's wiring before installation.\u003c\/p\u003e\n\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I wire this ignition switch to standard Bayliner harnesses?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It uses three screw-tab terminals compatible with standard Bayliner wiring, but verify terminal layout and ratings match your harness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does it resist corrosion in saltwater settings?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Marine-grade polyester housing, an inner seal, and brass backup nut provide enhanced corrosion resistance in marine environments.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":55167401427287,"sku":"B0000AXQML","price":42.09,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/sierra-mp39780-front-panel-shot.jpg?v=1790385853","url":"https:\/\/britishgarage.co.uk\/products\/sierra-bayliner-marine-ignition-switch-mp39780-short-profile-3-position-corrosion-resistant-15a-30a","provider":"British Garage","version":"1.0","type":"link"}