{"product_id":"marine-alternator-for-mercury-mercruiser-replaces-862031t-70a-12v-7si-hinge-mount-6-groove-2-44-serpentine-pulley-sierra-18-6293","title":"Sierra 18-6293 Marine Alternator, 12V 70A, Fits MerCruiser 454 Mag. MPI, 454 Mag. MPI MIE and 502 Mag. MPI GM V-8 (1998 and Up)","description":"\u003cp\u003eThe Sierra 18-6293 is a 12-volt, 70-amp marine alternator built to keep a stern drive's battery and electrical system properly charged under continuous marine duty. It is constructed with heavy-duty bearings and a heavy-duty regulator for extended service life, along with a high-quality stator and heavy-duty rectifiers to maintain charging efficiency even at high engine hours. Every unit is 100% load tested before it leaves the factory, so it is verified to perform correctly out of the box rather than relying on spot checks. The alternator meets or exceeds USCG, SAE J1171, and ISO 8846 marine safety standards, which govern spark and ignition protection aboard boats, so it is built specifically for the marine environment rather than adapted from an automotive part.\u003c\/p\u003e\u003cp\u003eElectrically it is a 12V, 70A unit with an internal fan, an M8-1.25 mounting stud, and a 6-groove, 2.44 inch diameter serpentine pulley. It uses a hinge mount configuration (7-SI style) with 8mm unthreaded mounting holes, and has a machined exterior finish. The 18-6293 is designed for MerCruiser 454 Mag. MPI, 454 Mag. MPI MIE, and 502 Mag. MPI GM V-8 engines from serial number 1998 and up, and it directly replaces several common Mercury Marine, Delco, Arco, API Marine, and Daewoo alternator part numbers, making it a straightforward drop-in charging system upgrade or replacement.\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 18-6293\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 70A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFan Type:\u003c\/strong\u003e Internal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStud Size:\u003c\/strong\u003e M8-1.25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulley Type:\u003c\/strong\u003e 6-Groove, 2.44 inch Diameter Serpentine Pulley\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Hinge Mount, 7-SI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Holes:\u003c\/strong\u003e 8mm Unthreaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 9.5 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 7.5 x 7.5 x 7.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282187378\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 454 Mag. MPI GM V-8, 1998 and up (serial number L010029 and up)\u003c\/li\u003e\n\u003cli\u003eMerCruiser 454 Mag. MPI MIE GM V-8, 1998 and up (serial number L002200 and up)\u003c\/li\u003e\n\u003cli\u003eMerCruiser 502 Mag. MPI GM V-8, 1998 and up (serial number L017000 and up)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 862031T, 862031, 862031T1\u003c\/li\u003e\n\u003cli\u003eAPI Marine 20099\u003c\/li\u003e\n\u003cli\u003eArco 20800\u003c\/li\u003e\n\u003cli\u003eDaewoo 219232\u003c\/li\u003e\n\u003cli\u003eDelco 19020601, 19020609\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-6293 alternator replace?\u003c\/strong\u003e The 18-6293 directly replaces Mercury Marine 862031T, 862031, and 862031T1, as well as API Marine 20099, Arco 20800, Daewoo 219232, and Delco 19020601 and 19020609.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-6293 a 12 volt or 24 volt alternator?\u003c\/strong\u003e It is a 12-volt, 70-amp alternator, sized for standard 12V stern drive charging systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-6293 fit?\u003c\/strong\u003e This alternator fits MerCruiser 454 Mag. MPI (serial number L010029 and up), 454 Mag. MPI MIE (serial number L002200 and up), and 502 Mag. MPI (serial number L017000 and up) GM V-8 engines, all from 1998 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the mounting stud on this alternator?\u003c\/strong\u003e The 18-6293 uses an M8-1.25 mounting stud.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat pulley does the 18-6293 use?\u003c\/strong\u003e A 6-groove serpentine pulley with a 2.44 inch diameter is fitted to this alternator.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the alternator internally or externally fanned?\u003c\/strong\u003e The Sierra 18-6293 has an internal fan design, matching the 7-SI style hinge mount configuration it uses.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-6293 alternator weigh and what are its dimensions?\u003c\/strong\u003e It weighs 9.5 pounds and measures approximately 7.5 x 7.5 x 7.5 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-6293 come tested before shipping?\u003c\/strong\u003e Yes, every 18-6293 alternator is 100% load tested at the factory for assured reliability out of the box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size are the mounting holes?\u003c\/strong\u003e The 18-6293 has 8mm unthreaded mounting holes as part of its hinge mount design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-6293 genuine OEM or an aftermarket part?\u003c\/strong\u003e It is a Sierra-manufactured marine alternator engineered to meet or exceed the performance of the original equipment part it replaces, including USCG, SAE J1171, and ISO 8846 standards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-6293 be used on both 454 Mag. MPI and 502 Mag. MPI engines?\u003c\/strong\u003e Yes, the same 18-6293 alternator is listed for MerCruiser 454 Mag. MPI, 454 Mag. MPI MIE, and 502 Mag. MPI GM V-8 engines from 1998 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-6293 alternator have?\u003c\/strong\u003e It has a machined exterior finish.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988356280539,"sku":"SIE-18-6293","price":226.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-6293__63763.1722381270.500.750.jpg?v=1785188319","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-alternator-for-mercury-mercruiser-replaces-862031t-70a-12v-7si-hinge-mount-6-groove-2-44-serpentine-pulley-sierra-18-6293","provider":"Good Vibes Marina","version":"1.0","type":"link"}