{"product_id":"mercury-mariner-force-3-cyl-outboard-ignition-trigger-replaces-817029a9-sierra-18-99419-mercury-90-95-hp-1993-1997-force-70-90-hp-1991-1995","title":"Sierra 18-99419 Trigger Assembly, 3-Cylinder, Replaces Mercury 817029A9 - Fits Mercury 90\/95 HP \u0026 Force 70\/90 HP Outboards","description":"\u003cp\u003eThe Sierra 18-99419 is a 3-cylinder trigger assembly for Mercury and Mariner outboard ignition systems. The trigger is the sensor component inside the ignition system that signals the CDI module when to fire each cylinder, so a worn or failed trigger typically causes misfiring, hard starting, rough idle, or a no-spark condition on one or more cylinders. Sierra 18-99419 is built as a direct fit replacement for the original Mercury\/Mariner trigger on applicable 3-cylinder outboard powerheads, restoring correct ignition timing signal output across all three cylinders.\u003c\/p\u003e\u003cp\u003eConstruction uses an aluminum housing for the trigger body, and the unit is rated for 12 volt marine ignition systems. It ships as a single trigger assembly ready to install in place of the original equipment part. Because the trigger is matched to the engine's timing and cylinder count, always confirm cylinder count and horsepower rating against your outboard before ordering.\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 18-99419\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinders:\u003c\/strong\u003e 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12 Volts\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 808282394509\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Stators \u0026amp; Triggers\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury 90 and 95 HP, 1993-1997\u003c\/li\u003e\n\u003cli\u003eForce 70 and 90 HP, 1991-1995\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e817029A9\u003c\/li\u003e\n\u003cli\u003e817029A3\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-99419 trigger do?\u003c\/strong\u003e It is the ignition trigger sensor inside a Mercury\/Mariner 3-cylinder outboard that signals the CDI module to fire each cylinder at the correct time, so replacing a worn Sierra 18-99419 restores proper ignition timing signal to all three cylinders.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines does the Sierra 18-99419 fit?\u003c\/strong\u003e The Sierra 18-99419 fits 3-cylinder Mercury 90 and 95 HP outboards from 1993-1997 and Force 70 and 90 HP outboards from 1991-1995.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does Sierra 18-99419 replace?\u003c\/strong\u003e Sierra 18-99419 replaces Mercury OEM trigger numbers 817029A9 and 817029A3.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-99419 a direct OEM replacement?\u003c\/strong\u003e Yes, Sierra 18-99419 is designed as a direct fit replacement for the original Mercury\/Mariner 817029A9 and 817029A3 trigger on applicable 3-cylinder outboards, with no modification required for installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-99419 trigger weigh?\u003c\/strong\u003e The Sierra 18-99419 trigger assembly weighs 0.6 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-99419 trigger made of?\u003c\/strong\u003e The trigger housing on the Sierra 18-99419 is aluminum.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat voltage ignition system is the Sierra 18-99419 designed for?\u003c\/strong\u003e Sierra 18-99419 is rated for 12 volt marine ignition systems, matching the standard electrical system on the Mercury and Force outboards it fits.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate a trigger like the Sierra 18-99419 needs replacing?\u003c\/strong\u003e A failing trigger typically causes misfiring, hard starting, rough idle, or a loss of spark on one or more cylinders; if these symptoms appear on a 3-cylinder Mercury or Force outboard, the trigger is a common cause to check.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many cylinders does the Sierra 18-99419 trigger cover?\u003c\/strong\u003e Sierra 18-99419 is built for 3-cylinder outboard powerheads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-99419 come as a complete assembly?\u003c\/strong\u003e Yes, it ships as a single complete trigger assembly ready to install in place of the original Mercury\/Mariner unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill Sierra 18-99419 work on a Force outboard, not just Mercury?\u003c\/strong\u003e Yes, in addition to Mercury 90 and 95 HP outboards, Sierra 18-99419 also fits Force 70 and 90 HP outboards from 1991-1995.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988460384475,"sku":"SIE-18-99419","price":120.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/img_c737120a-6317-4a39-86cb-6bbd617a1e80.jpg?v=1785332818","url":"https:\/\/www.goodvibesmarina.com\/products\/mercury-mariner-force-3-cyl-outboard-ignition-trigger-replaces-817029a9-sierra-18-99419-mercury-90-95-hp-1993-1997-force-70-90-hp-1991-1995","provider":"Good Vibes Marina","version":"1.0","type":"link"}