{"product_id":"voltage-regulator-for-mercury-mariner-outboard-135-225-hp-1981-1993-6-cyl-16-amp-replaces-88825a1-sierra-18-99434","title":"Sierra Voltage Regulator 18-99434 for Mercury 135-225 HP 6-Cylinder Outboards 1981-1993, Replaces 88825A7","description":"\u003cp\u003eThe Sierra 18-99434 is a 16-amp voltage regulator built for 6-cylinder Mercury outboard engines. It regulates charging output to the battery, protecting the electrical system from overcharging while keeping the battery topped off during operation. The regulator is housed in a waterproof plastic enclosure finished in black, designed to withstand the marine environment where it is mounted on the outboard.\u003c\/p\u003e\u003cp\u003eElectrically, the unit outputs 12 volts DC at up to 16 amps and connects to the existing engine harness through a 2-pin connector, making it a straightforward swap for a failed or worn regulator. It is built to fit Mercury outboard engines rated 135, 150, 175, 200, and 225 HP from 1981-1993, and is a direct replacement for the OEM Mercury voltage regulators it supersedes.\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 18-99434\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Voltage Regulator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Cylinder Configuration:\u003c\/strong\u003e 6-Cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 16 Amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Voltage:\u003c\/strong\u003e 12 Volts (DC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e 2-Pin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecial Feature:\u003c\/strong\u003e Waterproof\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.8 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282394653\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury outboard engines, 135, 150, 175, 200, and 225 HP, 1981-1993, 6-cylinder\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e194-8825K1\u003c\/li\u003e\n\u003cli\u003e88825A1\u003c\/li\u003e\n\u003cli\u003e88825A7\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99434 voltage regulator fit?\u003c\/strong\u003e It fits Mercury outboard engines rated 135, 150, 175, 200, and 225 HP from 1981-1993, and is built for 6-cylinder configurations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-99434 replace OEM part 88825A7?\u003c\/strong\u003e Yes, the 18-99434 is a direct replacement for OEM Mercury voltage regulators 194-8825K1, 88825A1, and 88825A7.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the amperage output of this voltage regulator?\u003c\/strong\u003e The Sierra 18-99434 delivers a 16-amp charging output to the battery.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat voltage does the 18-99434 regulator put out?\u003c\/strong\u003e It outputs 12 volts DC, matching standard marine 12-volt charging systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99434 waterproof?\u003c\/strong\u003e Yes, it is built with a waterproof housing suited to the marine environment it operates in.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the housing material and color of the 18-99434?\u003c\/strong\u003e The regulator has a black plastic enclosure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-99434 voltage regulator weigh?\u003c\/strong\u003e It weighs 0.8 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of connector does this voltage regulator use?\u003c\/strong\u003e The 18-99434 uses a 2-pin connector that plugs into the existing engine wiring harness.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-99434 fit a 4-cylinder Mercury outboard?\u003c\/strong\u003e No, this regulator is designed for 6-cylinder Mercury outboard engines in the 135-225 HP range from 1981-1993, not 4-cylinder models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99434 equivalent to the OEM Mercury regulator?\u003c\/strong\u003e Yes, the 18-99434 is a direct-fit equivalent to OEM Mercury regulators 194-8825K1, 88825A1, and 88825A7, offering the same 16-amp, 12-volt output.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988444262619,"sku":"SIE-18-99434","price":241.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-194-8825K1_lg__51674.1594925206.500.750.jpg?v=1785188459","url":"https:\/\/www.goodvibesmarina.com\/products\/voltage-regulator-for-mercury-mariner-outboard-135-225-hp-1981-1993-6-cyl-16-amp-replaces-88825a1-sierra-18-99434","provider":"Good Vibes Marina","version":"1.0","type":"link"}