{"product_id":"ignition-coil-for-johnson-evinrude-cross-flow-outboards-65-235-hp-replaces-582303-502886-sierra-18-99598","title":"Sierra Ignition Coil 18-99598 - Replaces OMC 502886, 582303, 582303-K, 581826 - Johnson\/Evinrude 3\/6 Cylinder 1972-1978","description":"\u003cp\u003eThe Sierra 18-99598 is a replacement ignition coil built for Johnson and Evinrude Cross Flow outboard engines. The ignition coil is the component that steps up battery voltage into the high-voltage spark needed to fire the spark plugs, and a weak or failed coil is a common cause of hard starting, misfiring, rough idle, or a no-spark condition. This coil is a plug-in installation with a male connector, and it includes the plug wire and hardware needed to complete the swap, so no separate wiring purchase is required.\u003c\/p\u003e\u003cp\u003eSierra 18-99598 is built to serve as a direct equivalent for the original equipment coil used on Cross Flow engines, cross-referencing to OMC part numbers 502886, 582303, 582303-K, and 581826. It fits 3-cylinder Cross Flow engines rated 65, 70, and 75 HP from 1972-1978, as well as 6-cylinder Cross Flow engines rated 150 to 235 HP from 1976-1978. Before ordering, confirm the part number against your engine's original coil or your engine manufacturer's recommended part number, since coil designs varied across these engine families.\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 18-99598\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Ignition Coil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Engine Family:\u003c\/strong\u003e Johnson\/Evinrude Cross Flow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Configuration:\u003c\/strong\u003e 3 Cylinder and 6 Cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower Range (3 Cylinder):\u003c\/strong\u003e 65, 70, 75 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower Range (6 Cylinder):\u003c\/strong\u003e 150 to 235 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Years (3 Cylinder):\u003c\/strong\u003e 1972-1978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Years (6 Cylinder):\u003c\/strong\u003e 1976-1978\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 Plug-in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Plug wire and hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.7 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 502886, 582303, 582303-K, 581826\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eJohnson\/Evinrude Cross Flow, 65, 70, 75 HP (3 cylinder), 1972-1978\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude Cross Flow, 150 to 235 HP (6 cylinder), 1976-1978\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e502886\u003c\/li\u003e\n\u003cli\u003e582303\u003c\/li\u003e\n\u003cli\u003e582303-K\u003c\/li\u003e\n\u003cli\u003e581826\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99598 ignition coil fit?\u003c\/strong\u003e The Sierra 18-99598 fits Johnson\/Evinrude Cross Flow outboard engines, specifically 65, 70, and 75 HP 3-cylinder models from 1972-1978 and 150 to 235 HP 6-cylinder models from 1976-1978.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does this coil replace?\u003c\/strong\u003e This coil cross-references to OMC part numbers 502886, 582303, 582303-K, and 581826, so it can be used as a direct equivalent for any of those original part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-99598 include the wiring needed for installation?\u003c\/strong\u003e Yes, the plug wire and mounting hardware are included, so the coil is ready to install without needing to source separate wiring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does this coil connect to the ignition harness?\u003c\/strong\u003e It uses a male connector and is a plug-in installation, meaning it connects directly into the existing harness without splicing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99598 ignition coil weigh?\u003c\/strong\u003e The Sierra 18-99598 ignition coil weighs 0.7 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this coil an aftermarket or genuine OEM part?\u003c\/strong\u003e The Sierra 18-99598 is an aftermarket replacement designed to serve as a direct equivalent to the original Johnson\/Evinrude coil, cross-referencing OEM numbers 502886, 582303, 582303-K, and 581826.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the symptoms of a failing ignition coil on a Cross Flow engine?\u003c\/strong\u003e Hard starting, rough idle, misfiring, and a complete loss of spark are common signs that the ignition coil on a Johnson\/Evinrude Cross Flow engine, such as the one replaced by the 18-99598, needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-99598 fit a 6-cylinder Cross Flow engine as well as a 3-cylinder engine?\u003c\/strong\u003e Yes, this part fits both configurations: 3-cylinder Cross Flow engines rated 65-75 HP from 1972-1978 and 6-cylinder Cross Flow engines rated 150-235 HP from 1976-1978.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I confirm the coil against my engine's original part number before ordering?\u003c\/strong\u003e Yes, since coil designs can vary within the Cross Flow engine family, it is recommended to check the 18-99598 against your engine's original coil or manufacturer-recommended part number before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-99598 sold as a single coil or a set?\u003c\/strong\u003e The 18-99598 is sold as a single ignition coil unit, complete with plug wire and hardware.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988446687451,"sku":"SIE-18-99598","price":56.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-183-2303_lg__43172.1558111102.500.750.jpg?v=1785188772","url":"https:\/\/www.goodvibesmarina.com\/products\/ignition-coil-for-johnson-evinrude-cross-flow-outboards-65-235-hp-replaces-582303-502886-sierra-18-99598","provider":"Good Vibes Marina","version":"1.0","type":"link"}