{"product_id":"sierra-18-5437-marine-ignition-coil-for-omc-sterndrive-cobra-replaces-omc-378231-383444-12v-metal-encased-with-external-resistor","title":"Sierra 18-5437 Ignition Coil - Replaces 3854161 - for 1996 OMC Sterndrive\/Cobra Stern Drive Applications","description":"\u003cp\u003eThe Sierra 18-5437 is a metal-encased 12 volt ignition coil built to deliver reliable spark energy in marine stern drive ignition systems. It uses an external resistor for all applications, a design that protects the coil winding from excess current draw once the engine is running and helps extend service life in the demanding marine environment. This coil is engineered to meet or exceed the performance of the original equipment part it replaces, making it a straightforward like-for-like replacement rather than a compromise substitute.\u003c\/p\u003e\u003cp\u003eElectrically, the 18-5437 is rated at 1.45 ohms (+\/-15%) primary resistance and 8.5 ohms (+\/-20%) secondary resistance, values that determine correct spark timing and voltage output for the ignition system it serves. It is finished in a metal housing for durability and terminates in a male connector for straightforward wiring during installation. Sierra supplies this part to OEM engine manufacturers and boat builders, so it is manufactured to the same quality standards as factory-installed coils.\u003c\/p\u003e\u003cp\u003eThis coil is built for 1996 model-year applications, specifically OMC Sterndrive\/Cobra stern drive setups. Always confirm your engine and ignition system before ordering to ensure correct fitment.\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 18-5437\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Ignition Coil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12 Volt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHousing:\u003c\/strong\u003e Metal Encased\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistor Type:\u003c\/strong\u003e Uses External Resistor (For All Applications)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Resistance:\u003c\/strong\u003e 1.45 ohms (+\/-15%)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary Resistance:\u003c\/strong\u003e 8.5 ohms (+\/-20%)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Gender:\u003c\/strong\u003e Male\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 5 x 3.5 x 5.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.38 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999236715\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1996 model-year applications\u003c\/li\u003e\n\u003cli\u003eOMC Sterndrive\/Cobra stern drive\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e3854161\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-5437 ignition coil replace?\u003c\/strong\u003e The Sierra 18-5437 replaces OEM cross-reference number 3854161, so any part carrying that number can be crossed to this coil.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5437 a 12 volt coil?\u003c\/strong\u003e Yes, the 18-5437 is a metal-encased 12 volt ignition coil designed for marine stern drive ignition systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this coil need an external resistor?\u003c\/strong\u003e Yes, the 18-5437 uses an external resistor for all applications rather than an internally resisted design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the primary and secondary resistance values of the 18-5437?\u003c\/strong\u003e Primary resistance is 1.45 ohms (+\/-15%) and secondary resistance is 8.5 ohms (+\/-20%) on the Sierra 18-5437 ignition coil.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and weight of the 18-5437 ignition coil?\u003c\/strong\u003e The coil measures 5 x 3.5 x 5.5 inches and weighs 1.38 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the housing material of the 18-5437?\u003c\/strong\u003e It has a metal-encased housing, which protects the internal windings in a marine environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of connector does the 18-5437 use?\u003c\/strong\u003e The Sierra 18-5437 terminates in a male connector for wiring into the ignition harness.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat applications is the 18-5437 built for?\u003c\/strong\u003e This coil is built for 1996 model-year applications on OMC Sterndrive\/Cobra stern drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5437 an OEM part or aftermarket?\u003c\/strong\u003e The 18-5437 is a Sierra-manufactured replacement engineered to meet or exceed the performance of the original equipment coil it replaces (OEM cross-reference 3854161), rather than a genuine OEM-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-5437?\u003c\/strong\u003e You receive one Sierra 18-5437 ignition coil, ready for installation in place of the coil it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the 18-5437 fits my stern drive?\u003c\/strong\u003e Confirm your ignition system uses OEM cross-reference 3854161 or matches a 1996 OMC Sterndrive\/Cobra stern drive application before ordering the 18-5437.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988217311451,"sku":"SIE-18-5437","price":42.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__78163.1753840678.500.750.jpg?v=1785188218","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5437-marine-ignition-coil-for-omc-sterndrive-cobra-replaces-omc-378231-383444-12v-metal-encased-with-external-resistor","provider":"Good Vibes Marina","version":"1.0","type":"link"}