{"product_id":"rectifier-regulator-35-amp-for-johnson-evinrude-outboards-sierra-18-99394","title":"Sierra Regulator\/Rectifier 18-99394, 35-Amp, for Johnson Evinrude Outboards","description":"\u003cp\u003eThe Sierra 18-99394 is a 35-amp regulator\/rectifier built for Johnson and Evinrude outboard charging systems. It converts the raw AC output from the outboard's stator into regulated DC current, protecting the battery and onboard electronics from overcharging while keeping the charging voltage within a safe, consistent range. As the charging system ages, a failing regulator\/rectifier is one of the most common causes of a battery that will not hold a charge, erratic voltage readings, or a battery that overcharges and boils dry, and replacing this component restores proper charging output.\u003c\/p\u003e\u003cp\u003eThis unit is designed as a direct-fit replacement for the applicable Johnson Evinrude outboard charging system, mounting in place of the factory regulator\/rectifier using the existing mounting points and wiring. It is a straightforward maintenance-level replacement for anyone servicing an aging or underperforming charging circuit on a Johnson or Evinrude outboard.\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 18-99394\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Evinrude Outboard Rectifier Regulator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 35 amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Type:\u003c\/strong\u003e Regulator\/Rectifier (AC to regulated DC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1 pound\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282394271\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits Johnson and Evinrude outboard engines.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-99394 regulator\/rectifier do?\u003c\/strong\u003e It converts the AC current produced by a Johnson or Evinrude outboard's stator into regulated DC current, controlling charging voltage so the battery charges properly without being overcharged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the 18-99394 fit?\u003c\/strong\u003e The Sierra 18-99394 is designed for Johnson and Evinrude outboard engines equipped with a 35-amp charging system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many amps does this regulator\/rectifier handle?\u003c\/strong\u003e It is rated for 35 amps of charging output.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99394 weigh?\u003c\/strong\u003e The Sierra 18-99394 regulator\/rectifier weighs 1 pound.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the symptoms of a failing regulator\/rectifier?\u003c\/strong\u003e A weak or dying battery, overcharging that boils battery fluid, erratic voltage readings, or a battery that will not hold a charge are common signs the regulator\/rectifier on a Johnson or Evinrude outboard needs replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-99394 a direct replacement for the factory unit?\u003c\/strong\u003e Yes, the Sierra 18-99394 is designed to mount in place of the original Johnson Evinrude regulator\/rectifier using the existing mounting points and wiring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install this regulator\/rectifier myself?\u003c\/strong\u003e Installation is a standard maintenance-level task involving disconnecting the old unit's wiring, mounting the Sierra 18-99394 in the same location, and reconnecting the charging circuit wiring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-99394 include mounting hardware?\u003c\/strong\u003e The dossier for the Sierra 18-99394 does not specify included mounting hardware; confirm hardware needs against your existing charging system components before installing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between a regulator and a rectifier?\u003c\/strong\u003e The Sierra 18-99394 combines both functions in one unit: the rectifier converts AC output from the stator into DC, and the regulator controls that DC output to a safe, consistent voltage for charging the battery.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99394 a genuine Sierra part?\u003c\/strong\u003e Yes, 18-99394 is the Sierra manufacturer part number for this Johnson Evinrude regulator\/rectifier.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988442362075,"sku":"SIE-18-99394","price":285.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-193-6048_lg__22060.1753365177.500.750.jpg?v=1785329180","url":"https:\/\/www.goodvibesmarina.com\/products\/rectifier-regulator-35-amp-for-johnson-evinrude-outboards-sierra-18-99394","provider":"Good Vibes Marina","version":"1.0","type":"link"}