{"product_id":"sierra-18-7493-marine-ignition-coil-for-mercruiser-8-1l-496-mag-replaces-392-889925-volvo-penta-3859078","title":"Sierra Ignition Coil 18-7493, Replaces Mercruiser 392889925, Fits 4.3L 5.0L 5.7L 6.2L with 555 ECM","description":"\u003cp\u003eThe Sierra 18-7493 is a replacement ignition coil engineered to meet or exceed OE manufacturer specifications for quality and performance. It fits 2001 and newer 4.3L, 5.0L, 5.7L, and 6.2L marine engines equipped with a 555 ECM, serial number OM300000 and up. This coil directly replaces OEM part number 392889925, making it a straightforward swap for boat owners servicing their ignition system.\u003c\/p\u003e\u003cp\u003eSierra builds this coil with a high-temperature dielectric epoxy that helps prevent moisture intrusion and thermal breakdown, two of the most common causes of ignition coil failure in a marine engine bay where heat and humidity are constant. The coil is constructed from high-grade materials for extended service life and consistent spark performance, and it uses a male connector for a secure, bolt-on installation. A failing ignition coil can cause hard starting, engine misfires, rough idle, or a complete no-start condition, so replacing it with a properly specified part like the 18-7493 helps restore reliable ignition system performance.\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 18-7493\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Ignition Coil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e 2001 and newer 4.3L, 5.0L, 5.7L \u0026amp; 6.2L with 555 ECM (OM300000 and up)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Gender:\u003c\/strong\u003e Male\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Type:\u003c\/strong\u003e Bolt-On\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.64 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282295004\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 392889925\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e2001 and newer 4.3L, 5.0L, 5.7L \u0026amp; 6.2L with 555 ECM (OM300000 and up)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e392889925\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-7493 ignition coil replace?\u003c\/strong\u003e The Sierra 18-7493 directly replaces OEM ignition coil number 392889925.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the 18-7493 ignition coil fit?\u003c\/strong\u003e It fits 2001 and newer 4.3L, 5.0L, 5.7L, and 6.2L marine engines equipped with a 555 ECM, serial number OM300000 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-7493 a direct bolt-on replacement?\u003c\/strong\u003e Yes, the 18-7493 is a bolt-on ignition coil with a male connector, designed to install in place of the original coil without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-7493 ignition coil weigh?\u003c\/strong\u003e The Sierra 18-7493 ignition coil weighs 0.64 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-7493 coil?\u003c\/strong\u003e The UPC for the Sierra 18-7493 ignition coil is 808282295004.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material protects the 18-7493 coil from moisture and heat?\u003c\/strong\u003e A high-temperature dielectric epoxy seals the 18-7493, helping prevent moisture intrusion and thermal breakdown in the marine engine environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-7493 work on my boat if I do not know my ECM serial number?\u003c\/strong\u003e Confirm your engine has a 555 ECM with a serial number of OM300000 or higher before ordering the 18-7493, since fitment is tied to that serial range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-7493 include mounting hardware?\u003c\/strong\u003e The 18-7493 ships as the ignition coil itself; no additional components are included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-7493 genuine OEM or aftermarket?\u003c\/strong\u003e The 18-7493 is a Sierra-branded aftermarket ignition coil engineered to meet or exceed OE manufacturer specifications, not an OEM-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate I need to replace my ignition coil with a part like the 18-7493?\u003c\/strong\u003e Hard starting, engine misfires, rough idle, or a no-start condition are common signs of a failing ignition coil, and installing the 18-7493 restores a coil built to the correct 555 ECM fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat connector type does the 18-7493 use?\u003c\/strong\u003e The Sierra 18-7493 ignition coil uses a male connector.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988385181915,"sku":"SIE-18-7493","price":128.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-7493__98862.1558186368.500.750.jpg?v=1785189078","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-7493-marine-ignition-coil-for-mercruiser-8-1l-496-mag-replaces-392-889925-volvo-penta-3859078","provider":"Good Vibes Marina","version":"1.0","type":"link"}