{"product_id":"sierra-18-6408-marine-alternator-105-amp-for-mercruiser-engines","title":"Sierra 18-6408 Marine Alternator - 105 Amp for Mercruiser Applications","description":"\u003cp\u003eThe Sierra 18-6408 is a 105 amp marine alternator built for Mercruiser applications. It replaces a worn or failed alternator to restore reliable charging output for the battery and onboard electrical systems, keeping ignition, electronics, and accessories powered while underway. The housing features a machined exterior finish, and the unit measures 8 x 8 x 7 inches and weighs 9.3 pounds.\u003c\/p\u003e\u003cp\u003eAs a Sierra branded part, the 18-6408 is manufactured to work as a direct fit within Mercruiser electrical systems, making it a straightforward swap for boat owners and marine technicians performing a charging system repair or upgrade. Its 105 amp output supports demanding onboard electrical loads, making it a solid choice for boats that run additional electronics, lighting, or accessories alongside standard engine and helm systems.\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 18-6408\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Alternator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 105 Amp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 9.3 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 8 x 8 x 7 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282378905\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Mercruiser alternator applications.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat amperage does the Sierra 18-6408 alternator produce?\u003c\/strong\u003e The Sierra 18-6408 is rated at 105 amps, providing charging output for the boat's battery and electrical systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the part number for this Sierra alternator?\u003c\/strong\u003e The part number is 18-6408, a Sierra branded marine alternator.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat boats or engines is the 18-6408 alternator designed for?\u003c\/strong\u003e This alternator is designed for Mercruiser applications, making it suited to boats running Mercruiser powertrains that need a 105 amp charging unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-6408 alternator weigh?\u003c\/strong\u003e It weighs 9.3 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-6408 alternator?\u003c\/strong\u003e The unit measures 8 x 8 x 7 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the alternator housing have?\u003c\/strong\u003e The Sierra 18-6408 has a machined exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-6408 a genuine Sierra part?\u003c\/strong\u003e Yes, the 18-6408 is a genuine Sierra branded 105 amp marine alternator.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-6408 alternator?\u003c\/strong\u003e The UPC for this Sierra alternator is 808282378905.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-6408 alternator handle extra onboard electronics?\u003c\/strong\u003e With a 105 amp rating, the Sierra 18-6408 supports demanding electrical loads from additional electronics, lighting, or accessories on Mercruiser powered boats.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when purchasing the 18-6408?\u003c\/strong\u003e The purchase includes the Sierra 18-6408 alternator unit itself, part number 18-6408.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988356378843,"sku":"SIE-18-6408","price":304.73,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-6408__22332.1722351226.500.750.jpg?v=1785189184","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-6408-marine-alternator-105-amp-for-mercruiser-engines","provider":"Good Vibes Marina","version":"1.0","type":"link"}