{"product_id":"mercury-mariner-3-cyl-trigger-assembly-replaces-99021a15-fits-1987-1999-45-jet-90-hp-outboards-sierra-18-99393","title":"Sierra 18-99393 Ignition Trigger for Mercury\/Mariner 3-Cylinder Outboards, 1987-1999, 45-90 HP, Replaces 99021A15","description":"\u003cp\u003eThe Sierra 18-99393 Ignition Trigger is a direct replacement trigger component for Mercury and Mariner 3-cylinder outboard engines built from 1987 to 1999. The trigger is a key part of the ignition system, working with the stator and switch box to generate the timing signal that fires the spark at the correct point in the engine cycle. A worn or failed trigger commonly causes hard starting, misfiring, poor idle, or a no-spark condition, making this a frequent replacement item for outboard owners maintaining or troubleshooting their ignition system.\u003c\/p\u003e\u003cp\u003eThis trigger is designed for Mercury\/Mariner 3-cylinder powerheads covering the 45 JET, 50, 60, 65, 70, 75, 80, and 90 HP range within the stated model years. It measures 7.1 x 6.3 x 1.9 inches and has a black finish. Because it cross-references to several original Mercury\/Mariner part numbers, it can be used to replace any of those numbers on qualifying 3-cylinder powerheads, giving owners and technicians a straightforward way to confirm fitment when servicing the ignition system.\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 18-99393\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Stators \u0026amp; Triggers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 7.1 x 6.3 x 1.9 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.6 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282394264\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 99021A15, 99021A16, 99021A13, 99021A8, 99021A3, 99021A5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercury\/Mariner 3-cylinder outboards, 1987-1999, 45 JET, 50, 60, 65, 70, 75, 80, 90 HP\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury\/Mariner 3-cylinder outboards, 1987-1999\u003c\/li\u003e\n\u003cli\u003e45 JET, 50, 60, 65, 70, 75, 80, and 90 HP\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e99021A15\u003c\/li\u003e\n\u003cli\u003e99021A16\u003c\/li\u003e\n\u003cli\u003e99021A13\u003c\/li\u003e\n\u003cli\u003e99021A8\u003c\/li\u003e\n\u003cli\u003e99021A3\u003c\/li\u003e\n\u003cli\u003e99021A5\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99393 trigger fit?\u003c\/strong\u003e It fits Mercury\/Mariner 3-cylinder outboards built from 1987 to 1999, covering the 45 JET, 50, 60, 65, 70, 75, 80, and 90 HP models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does this trigger replace?\u003c\/strong\u003e The Sierra 18-99393 cross-references to OEM numbers 99021A15, 99021A16, 99021A13, 99021A8, 99021A3, and 99021A5, so it can be used in place of any of those on a qualifying 3-cylinder powerhead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-99393 trigger?\u003c\/strong\u003e The trigger has a black finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this trigger?\u003c\/strong\u003e The Sierra 18-99393 measures 7.1 x 6.3 x 1.9 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-99393 trigger weigh?\u003c\/strong\u003e It weighs 0.6 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate a failing ignition trigger?\u003c\/strong\u003e Hard starting, misfiring, a rough or unstable idle, and a no-spark condition are common symptoms of a failing trigger on Mercury\/Mariner 3-cylinder outboards, and the Sierra 18-99393 is a direct replacement for these issues.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this trigger fit 2-cylinder or 4-cylinder Mercury outboards?\u003c\/strong\u003e No, the Sierra 18-99393 is designed specifically for Mercury\/Mariner 3-cylinder outboard engines within the 1987-1999 range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99393 trigger compatible with the 45 JET model?\u003c\/strong\u003e Yes, the 45 JET is one of the engines covered by the Sierra 18-99393, along with the 50, 60, 65, 70, 75, 80, and 90 HP 3-cylinder models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does an ignition trigger do in an outboard motor?\u003c\/strong\u003e The trigger works with the stator and switch box to generate the timing signal that tells the ignition system when to fire the spark, and the Sierra 18-99393 provides this function for Mercury\/Mariner 3-cylinder outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-99393 trigger?\u003c\/strong\u003e The UPC for the Sierra 18-99393 Mercury\/Mariner 3-cylinder trigger is 808282394264.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use this trigger to replace multiple different Mercury part numbers?\u003c\/strong\u003e Yes, because the Sierra 18-99393 cross-references six different OEM numbers (99021A15, 99021A16, 99021A13, 99021A8, 99021A3, 99021A5), it works as a replacement for any engine originally equipped with one of those parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat year range of Mercury\/Mariner outboards does this trigger cover?\u003c\/strong\u003e The Sierra 18-99393 covers Mercury\/Mariner 3-cylinder outboards built between 1987 and 1999.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988442394843,"sku":"SIE-18-99393","price":134.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-134-9021-3_lg__72757.1558114046.500.750.jpg?v=1785188399","url":"https:\/\/www.goodvibesmarina.com\/products\/mercury-mariner-3-cyl-trigger-assembly-replaces-99021a15-fits-1987-1999-45-jet-90-hp-outboards-sierra-18-99393","provider":"Good Vibes Marina","version":"1.0","type":"link"}