{"product_id":"mercury-mariner-3-cylinder-outboard-ignition-trigger-sierra-18-99396-replaces-855746a12-fits-30-90-hp-1996-2007","title":"Sierra 18-99396 Ignition Trigger for Mercury\/Mariner 3-Cylinder 30-90 HP Outboards, Replaces 855746A12","description":"\u003cp\u003eThe Sierra 18-99396 is an ignition trigger built for Mercury\/Mariner 3-cylinder outboards, replacing the factory trigger that signals the ignition system with crankshaft position for correct spark timing. It is a flange-mount component with a digital output type and a measuring range of 500 to 3000 RPM, rated to withstand temperatures up to 250 degrees Fahrenheit, making it suited to the heat and vibration found inside an outboard powerhead.\u003c\/p\u003e\u003cp\u003eThis trigger fits Mercury\/Mariner 3-cylinder outboards rated 30, 40, 50, 55, 65, 75 and 90 HP from 1996-2007, and is a direct replacement for the factory trigger assembly on these engines. It ships as a single unit ready to install in place of a worn or failed OEM trigger, restoring reliable ignition timing signal to the powerhead.\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 18-99396\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Mercury\/Mariner 3-cylinder outboards, 1996-2007\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower Range:\u003c\/strong\u003e 30, 40, 50, 55, 65, 75 and 90 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasuring Range:\u003c\/strong\u003e 500 to 3000 RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Flange mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Type:\u003c\/strong\u003e Digital\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpper Temperature Rating:\u003c\/strong\u003e 250 degrees Fahrenheit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 6 x 6 x 1.75 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 808282394295\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury\/Mariner 3-cylinder outboards, 1996-2007: 30, 40, 50, 55, 65, 75 and 90 HP\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e855746A12\u003c\/li\u003e\n\u003cli\u003e855746A1\u003c\/li\u003e\n\u003cli\u003e854512T\u003c\/li\u003e\n\u003cli\u003e834520T\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-99396 trigger fit?\u003c\/strong\u003e The Sierra 18-99396 fits Mercury\/Mariner 3-cylinder outboards rated 30, 40, 50, 55, 65, 75 and 90 HP built from 1996-2007.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does this trigger replace?\u003c\/strong\u003e Sierra 18-99396 replaces OEM Mercury\/Mariner numbers 855746A12, 855746A1, 854512T, and 834520T.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-99396 a direct OEM replacement or will I need to modify anything?\u003c\/strong\u003e Yes, the Sierra 18-99396 is a direct replacement for the listed OEM triggers on compatible 3-cylinder Mercury\/Mariner outboards, with no modification required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this trigger weigh?\u003c\/strong\u003e The Sierra 18-99396 ignition trigger weighs 0.6 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions of the 18-99396 trigger?\u003c\/strong\u003e This trigger measures 6 x 6 x 1.75 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the trigger mounted on the engine?\u003c\/strong\u003e The 18-99396 uses a flange mount for installation on compatible Mercury\/Mariner 3-cylinder powerheads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the operating RPM range of this trigger?\u003c\/strong\u003e Sierra 18-99396 has a measuring range of 500 to 3000 RPM.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat output type does the trigger use?\u003c\/strong\u003e The 18-99396 uses a digital output type to signal the ignition system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature can this trigger withstand?\u003c\/strong\u003e It is rated for operation up to 250 degrees Fahrenheit, suited to conditions inside a running outboard powerhead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this trigger include mounting hardware or other components?\u003c\/strong\u003e The Sierra 18-99396 ships as the trigger assembly itself; check your engine's service manual for any hardware reused from the original trigger during installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this work on a 4-cylinder Mercury outboard?\u003c\/strong\u003e No, the Sierra 18-99396 is built specifically for 3-cylinder Mercury\/Mariner outboards in the 30-90 HP range, not 4-cylinder models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 18-99396 if my engine trigger part number is 855746A12?\u003c\/strong\u003e Yes, the Sierra 18-99396 directly replaces OEM number 855746A12 along with 855746A1, 854512T, and 834520T.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988443050203,"sku":"SIE-18-99396","price":118.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-134-4512-3_lg__38740.1558112788.500.750.jpg?v=1785188025","url":"https:\/\/www.goodvibesmarina.com\/products\/mercury-mariner-3-cylinder-outboard-ignition-trigger-sierra-18-99396-replaces-855746a12-fits-30-90-hp-1996-2007","provider":"Good Vibes Marina","version":"1.0","type":"link"}