{"product_id":"mercury-mariner-outboard-voltage-regulator-40-amp-replaces-oem-18736-sierra-18-99442","title":"Sierra Mercury Mariner 40 Amp Voltage Regulator 18-99442, Replaces 18736","description":"\u003cp\u003eThe Sierra 18-99442 is a 40 amp voltage regulator built for Mercury and Mariner outboard engines. It manages charging output from the outboard's alternator\/stator system, regulating voltage delivered to the battery so onboard electronics and the starting battery receive a steady, controlled charge. A failed or failing regulator is a common cause of overcharging, undercharging, or a battery that will not hold a charge on Mercury and Mariner outboard applications, and replacing it with a properly rated 40 amp unit like the 18-99442 restores correct charging system operation.\u003c\/p\u003e\u003cp\u003eThis regulator is a direct cross-reference for OEM number 18736, making it a straightforward swap for boat owners and marine technicians servicing the charging system on Mercury\/Mariner outboards. It is sold as a standalone replacement part, so no separate wiring harness or bracket is included unless otherwise noted.\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 18-99442\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmp Rating:\u003c\/strong\u003e 40 Amp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercury\/Mariner Outboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.6 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282396268\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eMercury\/Mariner outboard engines.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e18736\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-99442 voltage regulator do?\u003c\/strong\u003e The Sierra 18-99442 regulates the charging voltage produced by a Mercury\/Mariner outboard's alternator, controlling how much current flows to the battery so it charges correctly without overcharging or undercharging.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99442 a 40 amp or a lower-amperage regulator?\u003c\/strong\u003e It is a 40 amp voltage regulator, matching the charging output of the Mercury\/Mariner outboard systems it is designed to service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-99442 replace OEM part 18736?\u003c\/strong\u003e Yes, Sierra part 18-99442 is a direct cross-reference for OEM number 18736.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the 18-99442 regulator fit?\u003c\/strong\u003e This regulator is built for Mercury and Mariner outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99442 regulator weigh?\u003c\/strong\u003e The Sierra 18-99442 weighs 1.6 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this regulator new or remanufactured?\u003c\/strong\u003e The Sierra 18-99442 is a new replacement voltage regulator, not a remanufactured or repaired unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-99442 regulator?\u003c\/strong\u003e The UPC for the Sierra 18-99442 Mercury\/Mariner voltage regulator is 808282396268.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace the voltage regulator on my Mercury outboard?\u003c\/strong\u003e A worn or failed voltage regulator like the one replaced by the 18-99442 commonly causes overcharging, undercharging, or a battery that will not hold a charge, so replacing it restores correct charging system function.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-99442 include mounting hardware or a wiring harness?\u003c\/strong\u003e The Sierra 18-99442 is sold as the regulator unit itself; no separate wiring harness or bracket is specified with this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use part number 18736 to search for this regulator?\u003c\/strong\u003e Yes, 18736 is the OEM number that the Sierra 18-99442 directly replaces, so it can be used to cross-reference the correct part.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988444754139,"sku":"SIE-18-99442","price":597.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-194-1873_lg__36257.1594924668.500.750.jpg?v=1785188012","url":"https:\/\/www.goodvibesmarina.com\/products\/mercury-mariner-outboard-voltage-regulator-40-amp-replaces-oem-18736-sierra-18-99442","provider":"Good Vibes Marina","version":"1.0","type":"link"}