{"product_id":"sierra-18-5815-starter-solenoid-for-mercury-mercruiser-outboard-replaces-89-68258a4-89-853654a1-2-cyl-in-line-6-mcm","title":"Sierra 18-5815 Starter Solenoid, Black, Replaces Mercury Marine 89-76545, Fits Mercruiser 300 3.4L Serial 5611648 \u0026 Up","description":"\u003cp\u003eThe Sierra 18-5815 is a black starter solenoid built as a direct replacement for Mercury Marine and Mercruiser engines. It handles the high-current switching duty of relaying battery power to the starter motor when the ignition is engaged, a role that sees repeated heat and vibration exposure in the engine compartment, so a solid factory-fit replacement matters for reliable starts. This solenoid is designed for Mercruiser 300 (3.4L) sterndrive applications with serial number 5611648 and up, and it cross-references directly to Mercury Marine OEM numbers 89-68258A4, 89-853654A1, and 89-76545, so it drops in without modification on engines originally equipped with those parts.\u003c\/p\u003e\u003cp\u003eSierra also offers part 18-5817 for the same application when the setup includes a circuit breaker and fuse; if your original solenoid was paired with those components, 18-5817 is the correct part rather than 18-5815. The 18-5815 measures 7 x 6 x 2.5 inches and weighs 0.61 pounds, making it a compact, straightforward swap for the factory unit.\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 18-5815\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Starter Solenoid\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999320049\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.61 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 7 x 6 x 2.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 89-68258A4, 89-853654A1, 89-76545\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercury\/Mercruiser 300 (3.4L), serial number 5611648 and up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelated Part:\u003c\/strong\u003e Sierra 18-5817 for circuit breaker and fuse equipped applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury\/Mercruiser 300 (3.4L), serial number 5611648 and up\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 89-68258A4\u003c\/li\u003e\n\u003cli\u003eMercury Marine 89-853654A1\u003c\/li\u003e\n\u003cli\u003eMercury Marine 89-76545\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-5815 solenoid fit?\u003c\/strong\u003e The Sierra 18-5815 is built for Mercury\/Mercruiser 300 (3.4L) sterndrive engines with serial number 5611648 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-5815 replace?\u003c\/strong\u003e Sierra 18-5815 cross-references to Mercury Marine OEM numbers 89-68258A4, 89-853654A1, and 89-76545, so it is a direct swap for engines originally equipped with any of those parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5815 the same as the Sierra 18-5817?\u003c\/strong\u003e No. Sierra 18-5815 and 18-5817 cover the same Mercruiser 300 (3.4L) application, but 18-5817 is the correct choice for setups that include a circuit breaker and fuse; 18-5815 does not include that configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-5815 solenoid?\u003c\/strong\u003e It is finished in black.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-5815 solenoid weigh?\u003c\/strong\u003e The 18-5815 weighs 0.61 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-5815?\u003c\/strong\u003e Sierra 18-5815 measures approximately 7 x 6 x 2.5 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5815 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-5815 is a Sierra-manufactured replacement solenoid engineered to cross-reference and fit in place of Mercury Marine OEM numbers 89-68258A4, 89-853654A1, and 89-76545, rather than a part sold under the Mercury Marine label.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-5815?\u003c\/strong\u003e Ordering Sierra 18-5815 gets you one starter solenoid; no additional wiring or mounting hardware is specified with this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-5815 work if my old solenoid has a circuit breaker and fuse?\u003c\/strong\u003e For applications that include a circuit breaker and fuse, Sierra specifies part 18-5817 instead of the 18-5815.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-5815 require any modification to install?\u003c\/strong\u003e No modification is indicated; the 18-5815 is designed as a direct-fit replacement for the listed Mercury\/Mercruiser 300 (3.4L) application and OEM cross-reference numbers.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988324888795,"sku":"SIE-18-5815","price":33.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5815_lg__84102.1558130465.500.750.jpg?v=1785188197","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5815-starter-solenoid-for-mercury-mercruiser-outboard-replaces-89-68258a4-89-853654a1-2-cyl-in-line-6-mcm","provider":"Good Vibes Marina","version":"1.0","type":"link"}