{"product_id":"mercury-mariner-2-cylinder-outboard-switch-box-ignition-pack-replacement-sierra-18-99218","title":"Sierra Switch Box 18-99218 for Mercury Mariner 2-Cylinder Outboard Engines","description":"\u003cp\u003eThe Sierra 18-99218 is a switch box built for Mercury Mariner 2-cylinder outboard engines. The switch box is a core ignition component that manages spark timing and power delivery to the engine, and this unit is manufactured to serve as a direct replacement on 2-cylinder Mercury Mariner powerheads. Sierra produces this part under its own part number for boat owners and marine technicians who need to replace a failed or aging switch box without sourcing directly from the engine manufacturer.\u003c\/p\u003e\u003cp\u003eBecause the switch box sits in the ignition circuit, a worn or failing unit can cause hard starting, misfiring, or a complete no-spark condition on 2-cylinder Mercury Mariner outboards. Replacing it with the correct part restores proper ignition function. This listing covers the Sierra 18-99218 specifically for 2-cylinder Mercury Mariner applications.\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 18-99218\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Switch Box\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Compatibility:\u003c\/strong\u003e Mercury Mariner 2-Cylinder Outboards\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 808282393878\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Mariner 2-cylinder outboard engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99218 switch box fit?\u003c\/strong\u003e The Sierra 18-99218 is built for Mercury Mariner 2-cylinder outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does a switch box do on an outboard engine?\u003c\/strong\u003e A switch box is an ignition component that controls spark timing and power delivery to the engine; on 2-cylinder Mercury Mariner outboards, the Sierra 18-99218 performs this role.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-99218 switch box weigh?\u003c\/strong\u003e It weighs 0.6 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99218 an OEM or aftermarket part?\u003c\/strong\u003e It is manufactured by Sierra, an aftermarket marine parts brand, under Sierra's own part number 18-99218.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-99218 switch box?\u003c\/strong\u003e The UPC is 808282393878.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this switch box work on a 4-cylinder or 6-cylinder Mercury outboard?\u003c\/strong\u003e No, the Sierra 18-99218 is designated for 2-cylinder Mercury Mariner outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are symptoms of a failing switch box on a 2-cylinder Mercury Mariner outboard?\u003c\/strong\u003e Hard starting, misfiring, or a no-spark condition can indicate a failing switch box; the Sierra 18-99218 is designed to replace the unit on 2-cylinder Mercury Mariner engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-99218 come with mounting hardware or wiring instructions?\u003c\/strong\u003e The listing does not specify included accessories beyond the switch box unit itself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99218 sold as a single unit?\u003c\/strong\u003e Yes, it is sold as a single switch box unit for 2-cylinder Mercury Mariner outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWho manufactures the 18-99218 switch box?\u003c\/strong\u003e Sierra manufactures the 18-99218 switch box for 2-cylinder Mercury Mariner outboard applications.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988438954203,"sku":"SIE-18-99218","price":295.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-114-6222_lg__57039.1748357361.500.750.jpg?v=1785188406","url":"https:\/\/www.goodvibesmarina.com\/products\/mercury-mariner-2-cylinder-outboard-switch-box-ignition-pack-replacement-sierra-18-99218","provider":"Good Vibes Marina","version":"1.0","type":"link"}