{"product_id":"voltage-regulator-for-mercury-outboard-16-40-amp-charging-systems-replaces-815279a2-883072t-sierra-18-5743-1","title":"Sierra Voltage Regulator 18-5743-1, Replaces 815279A2 815279-1, Fits Mercury 16\/40 Amp Charging Systems 1989-91","description":"\u003cp\u003eThe Sierra 18-5743-1 voltage regulator is a direct-fit electrical component for Mercury outboard engines equipped with a 16 amp or 40 amp charging system, model years 1989-91. It regulates the output of the engine's charging system, protecting the battery and onboard electronics from overcharging while maintaining stable voltage output during operation. The unit is wired with a black, yellow, red, red, yellow, and gray wire set; the black wire connects to engine ground.\u003c\/p\u003e\u003cp\u003eThis regulator is a straightforward replacement for the original Mercury charging system regulator on covered engines, restoring proper charging function without modifying existing wiring. It is built to the same fit and connection points as the original equipment part it replaces.\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 18-5743-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Voltage Regulator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282392321\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.63 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire Colors:\u003c\/strong\u003e Black, Yellow, Red, Red, Yellow, Gray\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround Wire:\u003c\/strong\u003e Black wire connects to engine ground\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCharging System Compatibility:\u003c\/strong\u003e 16 amp or 40 amp\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury engines with 16 amp or 40 amp charging system, model\/years 1989-91\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e815279A2\u003c\/li\u003e\n\u003cli\u003e815279-1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-5743-1 voltage regulator fit?\u003c\/strong\u003e This regulator fits Mercury engines equipped with a 16 amp or 40 amp charging system, model\/years 1989-91.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does this regulator replace?\u003c\/strong\u003e The 18-5743-1 replaces Mercury OEM part numbers 815279A2 and 815279-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the voltage regulator weigh?\u003c\/strong\u003e The Sierra 18-5743-1 weighs 0.63 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color wires does the 18-5743-1 have?\u003c\/strong\u003e It comes with black, yellow, red, red, yellow, and gray wires.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere does the black wire connect?\u003c\/strong\u003e The black wire on the 18-5743-1 goes to engine ground.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this regulator work with a 40 amp charging system?\u003c\/strong\u003e Yes, the 18-5743-1 is designed for Mercury engines with either a 16 amp or a 40 amp charging system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5743-1 a direct replacement for the original Mercury regulator?\u003c\/strong\u003e Yes, it is a direct replacement for Mercury regulators 815279A2 and 815279-1 on covered engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5743-1 fit engines from 1992 or later?\u003c\/strong\u003e No, this specific part number, the 18-5743-1, is designated for model\/years 1989-91.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this part?\u003c\/strong\u003e The Sierra 18-5743-1 voltage regulator has UPC 808282392321.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of engine charging system does this regulate?\u003c\/strong\u003e The 18-5743-1 regulates output on Mercury outboard engines with 16 amp or 40 amp charging systems.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988229959899,"sku":"SIE-18-5743-1","price":166.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5743-1__29048.1780061442.500.750.jpg?v=1785329190","url":"https:\/\/www.goodvibesmarina.com\/products\/voltage-regulator-for-mercury-outboard-16-40-amp-charging-systems-replaces-815279a2-883072t-sierra-18-5743-1","provider":"Good Vibes Marina","version":"1.0","type":"link"}