{"product_id":"switch-box-for-mercury-outboard-replaces-339-7452a19-339-7452a15-sierra-18-5777-1","title":"Sierra 18-5777-1 Switch Box, Replaces Mercury 339-7452A19, Fits Mercury 15\/20 HP Outboards","description":"\u003cp\u003eThe Sierra 18-5777-1 Switch Box is an ignition switch box built to meet or exceed the quality of the original equipment part it replaces. It is designed for Mercury outboard engines in the 15 HP and 20 HP range across specific serial number breaks, controlling the ignition timing and spark delivery that keeps the engine firing correctly. The housing has a machined exterior finish and is finished in black to match factory Mercury components.\u003c\/p\u003e\u003cp\u003eBecause ignition switch boxes are serial-number and horsepower specific on Mercury outboards, buyers should confirm the HP rating and serial number range of their engine against the fitment listed below before ordering. The 18-5777-1 is cross-referenced to several OEM and aftermarket part numbers, making it a direct swap for engines currently fitted with any of those original components. It ships as a single switch box unit ready to install in place of the worn or failed original.\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 18-5777-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 2.62 x 6 x 11.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.66 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282392628\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercury outboard, 15 HP and 20 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e CDI 114-7452K1, Mallory 9-25102, Mercury 339-7452A19, 339-7452A15, 339-7452A7, 339-7452A9\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury 15 HP, serial number B292414 through G760299\u003c\/li\u003e\n\u003cli\u003eMercury 15 HP, serial number G760300 and up\u003c\/li\u003e\n\u003cli\u003eMercury 15 HP, serial number G438000 through G760299\u003c\/li\u003e\n\u003cli\u003eMercury 20 HP, serial number 6443973 through G044026\u003c\/li\u003e\n\u003cli\u003eMercury 20 HP, serial number G438000 through G760299\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCDI 114-7452K1\u003c\/li\u003e\n\u003cli\u003eMallory 9-25102\u003c\/li\u003e\n\u003cli\u003eMercury 339-7452A19\u003c\/li\u003e\n\u003cli\u003eMercury 339-7452A15\u003c\/li\u003e\n\u003cli\u003eMercury 339-7452A7\u003c\/li\u003e\n\u003cli\u003eMercury 339-7452A9\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-5777-1 switch box fit?\u003c\/strong\u003e The 18-5777-1 fits Mercury outboard engines rated 15 HP and 20 HP within specific serial number ranges, including 15 HP units from serial B292414 through G760299, 15 HP units from G760300 and up, 15 HP units from G438000 through G760299, 20 HP units from 6443973 through G044026, and 20 HP units from G438000 through G760299.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5777-1 switch box interchangeable with OEM Mercury parts?\u003c\/strong\u003e Yes, the Sierra 18-5777-1 cross-references directly to Mercury 339-7452A19, 339-7452A15, 339-7452A7, and 339-7452A9, so it is a direct swap for engines currently fitted with any of those Mercury part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5777-1 replace any CDI or Mallory switch boxes?\u003c\/strong\u003e Yes, the Sierra 18-5777-1 also cross-references to CDI 114-7452K1 and Mallory 9-25102, making it a direct replacement for those aftermarket ignition switch boxes as well.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-5777-1 switch box weigh?\u003c\/strong\u003e This switch box weighs 0.66 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-5777-1 switch box?\u003c\/strong\u003e The switch box measures 2.62 x 6 x 11.25 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-5777-1 switch box?\u003c\/strong\u003e It is finished in black with a machined exterior.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5777-1 a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-5777-1 is a genuine Sierra switch box, built to meet or exceed the quality of the original Mercury equipment part it replaces rather than being a generic aftermarket copy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-5777-1 switch box?\u003c\/strong\u003e Ordering the Sierra 18-5777-1 includes one complete ignition switch box unit, ready to install in place of the original equipment switch box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm the 18-5777-1 is the correct switch box for my Mercury outboard?\u003c\/strong\u003e Check your Mercury outboard's horsepower rating and engine serial number against the fitment ranges for the 18-5777-1: 15 HP or 20 HP engines within the serial breaks listed for this part, since ignition switch boxes on these engines are serial-number specific.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the switch box do on a Mercury outboard?\u003c\/strong\u003e On the Mercury 15 HP and 20 HP outboards this part fits, the switch box manages ignition timing and spark delivery, and the Sierra 18-5777-1 is designed to perform this function as a direct replacement for the original unit.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988304081115,"sku":"SIE-18-5777-1","price":172.75,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-5777__28021.1737890726.500.750.jpg?v=1785188802","url":"https:\/\/www.goodvibesmarina.com\/products\/switch-box-for-mercury-outboard-replaces-339-7452a19-339-7452a15-sierra-18-5777-1","provider":"Good Vibes Marina","version":"1.0","type":"link"}