{"product_id":"sierra-bayliner-marine-ignition-switch-mp39780-short-mount-3-position-15a-30a-corrosion-resistant","title":"Sierra Bayliner Marine Ignition Switch MP39780 — Short-Mount 3-Position, 15A\/30A Corrosion-Resistant","description":"\u003cp\u003e\u003cstrong\u003eSierra's MP39780 Bayliner marine ignition switch is a compact, three-position panel switch engineered for boats, offering a 15A ignition circuit and a 30A solenoid feed in a corrosion-resistant, short-mount housing.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis ignition switch fits a 7\/8\" dash hole and accommodates panels up to 5\/8\" thick. Built from marine-grade, glass-filled polyester with an inner seal between the cylinder and contact plate and a brass backup nut, the MP39780 prioritizes long-term electrical reliability in salty and humid environments. It uses three screw-tab terminals for simple wiring and is a conventional three-position key switch suitable for many Bayliner and similar small craft applications.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this switch handle marine corrosion and moisture?\u003c\/h3\u003e\n\u003cp\u003eThe MP39780 incorporates materials and design features that reduce corrosion risk and prevent oxidation of internal contacts. Its non-conductive housing and inner seal limit water intrusion while the brass backup nut offers durable thread security where metal meets plastic.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMarine-grade glass-filled polyester body resists saltwater corrosion.\u003c\/li\u003e\n  \u003cli\u003eInner seal between cylinder and contact plate keeps moisture away from contacts.\u003c\/li\u003e\n  \u003cli\u003eBrass backup nut prevents thread corrosion and maintains panel clamping.\u003c\/li\u003e\n  \u003cli\u003eBlack hex face nut provides a secure, weather-resistant bezel finish.\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 is rated for 15 amps at 12 V DC on the ignition circuit and 30 amps at 12 V DC for the solenoid output, matching common small-boat starter and ignition loads. Wiring is straightforward thanks to three screw-tab terminals sized for secure screw or ring-lug connections.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRated ignition: 15 A @ 12 V DC — suitable for small outboard\/inline ignition circuits.\u003c\/li\u003e\n  \u003cli\u003eRated solenoid: 30 A @ 12 V DC — powers most starter solenoids through the switch.\u003c\/li\u003e\n  \u003cli\u003eThree screw-tab terminals for dependable, serviceable wiring.\u003c\/li\u003e\n  \u003cli\u003eConventional three-position key operation (off\/aux\/start or equivalent).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this fit my dash and how is it mounted?\u003c\/h3\u003e\n\u003cp\u003ePlan for a 7\/8\" mounting hole and a maximum panel thickness of 5\/8\" when replacing or installing this switch. The short mounting length makes it ideal where behind-dash clearance is limited; confirm your panel depth and hole size before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRequired hole size: 7\/8\" — standard small-dash opening for many marine switches.\u003c\/li\u003e\n  \u003cli\u003eMaximum panel thickness: 5\/8\" for the short-mount configuration.\u003c\/li\u003e\n  \u003cli\u003eFace nut is a black hex plastic for a neat, finished appearance.\u003c\/li\u003e\n  \u003cli\u003eCompact length suits tight instrument panels on runabouts and small cruisers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat practical features help with installation and serviceability?\u003c\/h3\u003e\n\u003cp\u003eInstallation benefits include screw-tab terminals for reliable connections and a hex face nut for easy tightening from the front. The non-conductive housing reduces the chance of shorts, and the inner seal simplifies maintenance by keeping critical contact points cleaner longer.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThree screw-tab terminals allow fast, secure wiring and straightforward troubleshooting.\u003c\/li\u003e\n  \u003cli\u003eNon-conductive housing reduces grounding or shorting risks during wiring.\u003c\/li\u003e\n  \u003cli\u003eBrass backup nut gives a strong clamping point behind the panel for long-term stability.\u003c\/li\u003e\n  \u003cli\u003eInner cylinder-to-plate seal lowers oxidation and contact wear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Sierra MP39780 Bayliner ignition switch is intended for boat owners, marine electricians, and DIYers seeking a compact, conventional three-position key switch with marine-grade materials and reliable electrical ratings. It's a practical replacement or upgrade for small to medium recreational craft dashboards where a short mount and corrosion resistance are priorities, and where 15A ignition and 30A solenoid capacity meet the vessel's electrical demands.\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 this require?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Requires a 7\/8\" hole and supports panel thickness up to 5\/8\" in the short-mount configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What are the electrical ratings and terminal type?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Rated 15A for ignition and 30A for solenoid at 12V DC, with three screw-tab terminals for wiring.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":67589779390649,"sku":"B0000AXQML","price":76.03,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/sierra-bayliner-ignition-switch-front-panel.jpg?v=1790531642","url":"https:\/\/redleafauto.ca\/products\/sierra-bayliner-marine-ignition-switch-mp39780-short-mount-3-position-15a-30a-corrosion-resistant","provider":"Redleaf Auto","version":"1.0","type":"link"}