{"product_id":"marine-starter-solenoid-for-omc-sterndrive-cobra-stern-drive-replaces-omc-985063-12v-isolated-base-sierra-18-5812","title":"Sierra 18-5812 Marine Solenoid, Isolated Base, 12 Volt, for OMC Cobra Stern Drive 4.3L-7.5L","description":"\u003cp\u003eThe Sierra 18-5812 is a 12 volt marine solenoid built with an isolated base for OMC Cobra Stern Drive applications. It is designed to meet or exceed original equipment quality, giving boat owners a dependable way to restore starting and electrical switching function without sourcing a discontinued original equipment part. The solenoid has a white finish and a machined exterior, and its isolated base construction keeps the electrical circuit separated from the mounting surface, which helps prevent stray grounding issues on stern drive electrical systems.\u003c\/p\u003e\u003cp\u003eThis solenoid is a direct fit for a range of OMC Cobra Stern Drive engine sizes and model years, making it a straightforward replacement for boaters who need to match their existing setup exactly. Because it is fit specific, buyers should confirm their engine size and model year against the fitment listed below before ordering. The 18-5812 is sized at 6 x 2.5 x 6 inches and weighs 0.62 pounds, keeping it consistent with the compact solenoid form factor expected on stern drive engines.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-5812\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Marine Solenoid\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12 Volts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Type:\u003c\/strong\u003e Isolated base\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 6 x 2.5 x 6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.62 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e OMC 985063, OMC 982187, OMC 581528, 172869, Arco SW268, GLM 72403, Mallory 9-15107\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC Cobra Stern Drive 4.3L, 1989-90\u003c\/li\u003e\n\u003cli\u003eOMC Cobra Stern Drive 5.0L, 1986-88\u003c\/li\u003e\n\u003cli\u003eOMC Cobra Stern Drive 5.7L, 1986-88\u003c\/li\u003e\n\u003cli\u003eOMC Cobra Stern Drive 5.7L, 1989\u003c\/li\u003e\n\u003cli\u003eOMC Cobra Stern Drive 7.5L, 1987\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC 985063\u003c\/li\u003e\n\u003cli\u003eOMC 982187\u003c\/li\u003e\n\u003cli\u003eOMC 581528\u003c\/li\u003e\n\u003cli\u003e172869\u003c\/li\u003e\n\u003cli\u003eArco SW268\u003c\/li\u003e\n\u003cli\u003eGLM 72403\u003c\/li\u003e\n\u003cli\u003eMallory 9-15107\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-5812 used for?\u003c\/strong\u003e The Sierra 18-5812 is a 12 volt marine solenoid used on OMC Cobra Stern Drive engines to handle electrical switching, most commonly in the starting circuit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-5812 fit my OMC Cobra Stern Drive engine?\u003c\/strong\u003e Fitment depends on engine size and model year: the 18-5812 fits the 4.3L (1989-90), 5.0L (1986-88), 5.7L (1986-88 and 1989), and 7.5L (1987) OMC Cobra Stern Drive engines. Because this solenoid is fit specific, confirm your engine size and year before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5812 a 12 volt solenoid?\u003c\/strong\u003e Yes, the 18-5812 is a 12 volt solenoid with an isolated base.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does isolated base mean on this solenoid?\u003c\/strong\u003e An isolated base means the electrical circuit inside the 18-5812 solenoid is separated from the metal mounting base, which helps prevent unwanted grounding through the mounting surface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-5812 replace?\u003c\/strong\u003e The 18-5812 replaces OMC 985063, OMC 982187, OMC 581528, and 172869, and is interchangeable with Arco SW268, GLM 72403, and Mallory 9-15107.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and finish is the 18-5812 solenoid?\u003c\/strong\u003e This solenoid has a white housing with a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and weight of the 18-5812?\u003c\/strong\u003e The Sierra 18-5812 measures 6 x 2.5 x 6 inches and weighs 0.62 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5812 an original equipment part or aftermarket?\u003c\/strong\u003e The 18-5812 is an aftermarket replacement solenoid built to meet or exceed original equipment quality, not an original OMC-branded component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5812 come with mounting hardware?\u003c\/strong\u003e The dossier for the 18-5812 does not list included mounting hardware; it covers only the solenoid itself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the Sierra 18-5812 different from OMC 985063?\u003c\/strong\u003e Functionally the 18-5812 is a direct cross reference to OMC 985063, providing the same isolated base 12 volt solenoid operation for OMC Cobra Stern Drive engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988324036827,"sku":"SIE-18-5812","price":30.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5812_lg__52368.1558130310.500.750.jpg?v=1785188551","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-starter-solenoid-for-omc-sterndrive-cobra-stern-drive-replaces-omc-985063-12v-isolated-base-sierra-18-5812","provider":"Good Vibes Marina","version":"1.0","type":"link"}