{"product_id":"sierra-18-5776-switch-box-for-mercury-mariner-outboards-replaces-mercury-339-7452a3-339-7452a2-339-7452a1","title":"Sierra Switch Box 18-5776-1 for Mercury 18 HP and 25 HP Outboard Motors","description":"\u003cp\u003eThe Sierra 18-5776-1 Switch Box is an ignition switch box built to meet or exceed the quality of the original equipment part it replaces. It serves as the ignition control component on select Mercury outboard motors, managing the electrical signal that fires the spark at the correct time for reliable engine starting and running performance. The switch box is a direct fit for the specific Mercury outboard applications listed below, so confirming your engine's serial number before ordering is important to ensure proper fit.\u003c\/p\u003e\u003cp\u003eThis switch box is engineered as a precise replacement, matching the form, fit, and function of the original Mercury switch box on covered applications. It is compatible with aftermarket cross-reference parts from other major ignition brands, giving boat owners a dependable option when sourcing a replacement for aging or failed ignition components.\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 18-5776-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Switch Box\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.21 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Engine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282392611\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury 18 HP outboard, serial numbers 5837437 to 6443972\u003c\/li\u003e\n\u003cli\u003eMercury 25 HP outboard, serial numbers 5705532 to 6443972\u003c\/li\u003e\n\u003cli\u003eMercury 25 HP outboard with nut connection, serial numbers 6443973 and up\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCDI 114-7452A3\u003c\/li\u003e\n\u003cli\u003eMallory 9-25101\u003c\/li\u003e\n\u003cli\u003eMercury 339-7452A3\u003c\/li\u003e\n\u003cli\u003eMercury 339-7452A2\u003c\/li\u003e\n\u003cli\u003eMercury 339-7452A1\u003c\/li\u003e\n\u003cli\u003eMercury 899883230\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-5776-1 switch box used for?\u003c\/strong\u003e The Sierra 18-5776-1 is an ignition switch box that controls the timing of the spark signal on compatible Mercury outboard motors, and it is required for the engine to start and run.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Mercury outboards fit the 18-5776-1 switch box?\u003c\/strong\u003e This switch box fits Mercury 18 HP outboards with serial numbers 5837437 to 6443972, and Mercury 25 HP outboards with serial numbers 5705532 to 6443972 or, for the nut connection version, serial numbers 6443973 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my engine uses the nut connection version?\u003c\/strong\u003e Mercury 25 HP outboards with serial number 6443973 and up use the nut connection switch box, which is the configuration supplied by the Sierra 18-5776-1; earlier 25 HP serial numbers in the 5705532 to 6443972 range use a different connection type.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-5776-1 switch box replace?\u003c\/strong\u003e The Sierra 18-5776-1 cross-references to Mercury 339-7452A3, 339-7452A2, 339-7452A1, and 899883230, as well as CDI 114-7452A3 and Mallory 9-25101.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5776-1 an OEM or aftermarket switch box?\u003c\/strong\u003e It is an aftermarket switch box manufactured by Sierra that is designed to meet or exceed the quality of the original Mercury equipment it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-5776-1 switch box?\u003c\/strong\u003e The switch box has a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-5776-1 switch box weigh?\u003c\/strong\u003e The Sierra 18-5776-1 switch box weighs 0.21 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-5776-1 switch box?\u003c\/strong\u003e The unit measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-5776-1 on any Mercury outboard?\u003c\/strong\u003e No, fit is specific to certain Mercury 18 HP and 25 HP outboards by serial number range, so the serial number should be checked against the fitment before ordering the 18-5776-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the switch box come as a single unit?\u003c\/strong\u003e Yes, the Sierra 18-5776-1 is supplied as one switch box unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs there a different part number for other Mercury serial ranges?\u003c\/strong\u003e Yes, other Mercury 18, 20, and 25 HP serial ranges use a different Sierra switch box part number, so confirming the exact serial number is necessary before ordering the 18-5776-1.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988304015579,"sku":"SIE-18-5776-1","price":161.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5776_lg__76034.1558128453.500.750.jpg?v=1785189189","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5776-switch-box-for-mercury-mariner-outboards-replaces-mercury-339-7452a3-339-7452a2-339-7452a1","provider":"Good Vibes Marina","version":"1.0","type":"link"}