{"product_id":"sierra-18-99397-ignition-trigger-for-mercury-mariner-6-cylinder-outboards-135-200-hp-240-sportjet-2000-2007-replaces-96455a18-96455t18","title":"Sierra CDM Trigger 18-99397 for Mercury\/Mariner 6 Cylinder Outboards, Replaces 96455A18 96455T18","description":"\u003cp\u003eThe Sierra 18-99397 is a CDM trigger built for Mercury and Mariner 6 cylinder outboard engines. The trigger is a key component of the ignition system, signaling the CDM (Capacitor Discharge Module) to fire the spark at the correct point in the engine cycle. A worn or failing trigger commonly causes misfiring, hard starting, rough idle, or a no-spark condition on one or more cylinders, and replacing it with a properly matched unit restores consistent ignition timing across all six cylinders.\u003c\/p\u003e\u003cp\u003eThis trigger is designed as a direct fit for Mercury\/Mariner 6 cylinder outboards covering the 135, 140, 150, 175, 200, and 240 HP SportJet models from 2000 to 2007. It corresponds to the OEM part numbers 96455A18 and 96455T18, making it straightforward to identify as the correct replacement when cross-referencing against the original Mercury\/Mariner part on the engine. It measures 6 x 6 x 1.75 inches and weighs 0.4 pounds, in line with the compact triggers used in these outboard ignition systems.\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 18-99397\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e CDM Trigger\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Fitment:\u003c\/strong\u003e Mercury\/Mariner 6 Cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHP Fitment:\u003c\/strong\u003e 135, 140, 150, 175, 200, 240 HP SportJet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Years:\u003c\/strong\u003e 2000-2007\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.4 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 6 x 6 x 1.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 96455A18, 96455T18\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury\/Mariner 6 cylinder outboards: 135, 140, 150, 175, 200, and 240 HP SportJet, 2000-2007\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e96455A18\u003c\/li\u003e\n\u003cli\u003e96455T18\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99397 CDM trigger fit?\u003c\/strong\u003e The Sierra 18-99397 fits Mercury\/Mariner 6 cylinder outboards including the 135, 140, 150, 175, 200, and 240 HP SportJet models from 2000 to 2007.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does this trigger replace?\u003c\/strong\u003e It replaces Mercury\/Mariner OEM part numbers 96455A18 and 96455T18, so it can be used as a direct swap for either of those numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does a CDM trigger actually do?\u003c\/strong\u003e A CDM trigger signals the Capacitor Discharge Module at the precise moment to fire the spark for each cylinder, so the 18-99397 keeps ignition timing synchronized across all six cylinders of the outboard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99397 trigger weigh?\u003c\/strong\u003e The Sierra 18-99397 CDM trigger weighs 0.4 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this part?\u003c\/strong\u003e The 18-99397 measures 6 x 6 x 1.75 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate this trigger needs replacement?\u003c\/strong\u003e Misfiring, rough idle, hard starting, or a no-spark condition on one or more cylinders are common signs that the CDM trigger on a Mercury\/Mariner 6 cylinder outboard has failed and needs replacement with a part like the 18-99397.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-99397 an exact match for the 96455A18 and 96455T18 triggers?\u003c\/strong\u003e Yes, the Sierra 18-99397 is built to the same fitment as the 96455A18 and 96455T18 OEM triggers, covering the same 2000-2007 Mercury\/Mariner 6 cylinder engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this trigger fit 4 cylinder Mercury outboards?\u003c\/strong\u003e No, the 18-99397 is designed specifically for 6 cylinder Mercury\/Mariner outboards, not 4 cylinder engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this trigger be used on the 240 HP SportJet?\u003c\/strong\u003e Yes, the 240 HP SportJet is one of the 6 cylinder engines covered by the Sierra 18-99397, alongside the 135, 140, 150, 175, and 200 HP models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat years of Mercury\/Mariner 6 cylinder outboards use this trigger?\u003c\/strong\u003e Model years 2000 through 2007 use the 18-99397 CDM trigger on the 135-240 HP 6 cylinder SportJet engine range.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988442591451,"sku":"SIE-18-99397","price":209.09,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-134-6456-18_lg__66577.1748362961.500.750.jpg?v=1785188236","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-99397-ignition-trigger-for-mercury-mariner-6-cylinder-outboards-135-200-hp-240-sportjet-2000-2007-replaces-96455a18-96455t18","provider":"Good Vibes Marina","version":"1.0","type":"link"}