{"product_id":"sierra-18-5965-marine-alternator-replaces-mercruiser-78403a2-90794-fits-37-63a-marine-applications","title":"Sierra Alternator 18-5965, Replaces Mercruiser 98555A1, Fits GM V-8 454 Mag. MPI, MPI MIE and EFI Ski Engines","description":"\u003cp\u003eThe Sierra 18-5965 is a marine alternator engineered for GM V-8 454 cubic inch inboard\/sterndrive engines, built to meet or exceed the output and durability of the original equipment part it replaces. It is designed as a direct-fit charging system component for 454 Mag. MPI, 454 Mag. MPI MIE, and 454 EFI Ski engine applications within the specified serial number ranges, restoring reliable charging output for boats where the factory alternator has failed or is worn out.\u003c\/p\u003e\u003cp\u003eThe housing is constructed of aluminum for corrosion resistance in a marine environment, and the unit uses a flat ribbon cable with a Bat\/Alternator connector configuration for straightforward wiring to the existing engine harness. Because it is built to marine-duty standards rather than automotive standards, it is suited to the vibration, heat, and moisture exposure typical of inboard and sterndrive installations. The 18-5965 cross-references directly to a number of OEM and aftermarket part numbers, making it easy to confirm as the correct replacement before ordering.\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 18-5965\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Alternator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions (L x W x H):\u003c\/strong\u003e 3.5 x 7 x 5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Bat, Alternator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Type:\u003c\/strong\u003e Flat Ribbon\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999775870\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e454 Mag. MPI, GM V-8, 1994-1997, serial numbers F115700 through K999999\u003c\/li\u003e\n\u003cli\u003e454 Mag. MPI MIE, GM V-8, 1996-1997, serial numbers F820100 through K999999\u003c\/li\u003e\n\u003cli\u003e454 EFI Ski, GM V-8, 1995-1996, serial numbers F215800 through F820099\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eArco 60065\u003c\/li\u003e\n\u003cli\u003eMallory 9-19103\u003c\/li\u003e\n\u003cli\u003eMercruiser 98555A1\u003c\/li\u003e\n\u003cli\u003eMercruiser 92497\u003c\/li\u003e\n\u003cli\u003eMercruiser 12449\u003c\/li\u003e\n\u003cli\u003eMercruiser 12449A1\u003c\/li\u003e\n\u003cli\u003eMercruiser 92497A3\u003c\/li\u003e\n\u003cli\u003eMercruiser 817119A1\u003c\/li\u003e\n\u003cli\u003eMercruiser 817119A4\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-5965 alternator fit?\u003c\/strong\u003e The Sierra 18-5965 fits GM V-8 454 Mag. MPI engines (serial numbers F115700 through K999999, 1994-1997), 454 Mag. MPI MIE engines (serial numbers F820100 through K999999, 1996-1997), and 454 EFI Ski engines (serial numbers F215800 through F820099, 1995-1996).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-5965 a direct replacement for Mercruiser 98555A1?\u003c\/strong\u003e Yes, the Sierra 18-5965 alternator cross-references directly to Mercruiser 98555A1, as well as Mercruiser 92497, 12449, 12449A1, 92497A3, 817119A1, and 817119A4.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other brands' part numbers does this alternator cross-reference to?\u003c\/strong\u003e Beyond the Mercruiser numbers, the 18-5965 cross-references to Arco 60065 and Mallory 9-19103.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the alternator housing made of?\u003c\/strong\u003e The 18-5965 has an aluminum housing, chosen for its corrosion resistance in marine environments.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-5965 alternator weigh and what are its dimensions?\u003c\/strong\u003e The Sierra 18-5965 weighs 12 pounds and measures 3.5 x 7 x 5 inches (L x W x H).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this alternator fit a 1998 or newer 454 Mag. MPI engine?\u003c\/strong\u003e No. For 454 Mag. MPI engines with serial number L010029 and up (1998 and later), the correct alternator is Sierra 18-6293, a different part number than the 18-5965.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of electrical connector does the 18-5965 use?\u003c\/strong\u003e The 18-5965 uses a Bat\/Alternator connector configuration with a flat ribbon cable, matching the factory wiring layout on these GM V-8 engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5965 an OEM or aftermarket alternator?\u003c\/strong\u003e The 18-5965 is a Sierra-manufactured replacement alternator built to meet or exceed the performance of the original equipment alternator it replaces, rather than a genuine Mercruiser part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5965 fit the 454 EFI Ski engine?\u003c\/strong\u003e Yes, the Sierra 18-5965 is listed for the 454 EFI Ski, GM V-8, within the serial number range F215800 through F820099 (1995-1996).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the 18-5965 come with?\u003c\/strong\u003e The 18-5965 is supplied as a single alternator unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-5965 fit a 454 Mag. MPI MIE engine?\u003c\/strong\u003e Yes, it is listed for the 454 Mag. MPI MIE, GM V-8, in the serial number range F820100 through K999999 (1996-1997).\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988347236571,"sku":"SIE-18-5965","price":230.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__34438.1753840682.500.750.jpg?v=1785188866","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5965-marine-alternator-replaces-mercruiser-78403a2-90794-fits-37-63a-marine-applications","provider":"Good Vibes Marina","version":"1.0","type":"link"}