{"product_id":"sierra-18-99421-mercruiser-voltage-regulator","title":"Sierra Mercruiser Voltage Regulator","description":"\u003cp\u003eSierra 18-99421 MerCruiser Voltage Regulator Replaces CDI 194-9502\u003c\/p\u003e\u003cp\u003eThis Sierra voltage regulator is for use with MerCruiser electrical systems.\u003c\/p\u003e\u003cp\u003eSierra 18-99421 Voltage Regulator Application Information\u003c\/p\u003e\u003cp\u003eFits: 470 w\/2 BBL Carb from 1976-1984\u003c\/p\u003e\u003cp\u003eFits: 485 \u0026amp; 488 w\/ 2 BBL Carb from 1980-1984\u003c\/p\u003e\u003cp\u003eFits: 170 \u0026amp; 190 from 1985-1986\u003c\/p\u003e\u003cp\u003eFits: 165 \u0026amp; 180 from 1987\u003c\/p\u003e\u003cp\u003eFits: 3.7L from 1988-1989\u003c\/p\u003e\u003cp\u003eInterchangeable With:\u003c\/p\u003e\u003cp\u003eCDI\u003c\/p\u003e\u003cp\u003e194-9502\u003c\/p\u003e\u003cp\u003eMercury\u003c\/p\u003e\u003cp\u003e77305A2\u003c\/p\u003e\u003cp\u003e86255A2\u003c\/p\u003e\u003cp\u003e86255A3\u003c\/p\u003e\u003cp\u003e99502A12\u003c\/p\u003e\u003cp\u003e99502A13\u003c\/p\u003e\u003cp\u003e99502A7\u003c\/p\u003e\u003cp\u003e99502A8\u003c\/p\u003e\u003cp\u003e99502A9\u003c\/p\u003e\u003cp\u003eClick here for Sierra 18-99421 Voltage Regulator Installation Instructions\u003c\/p\u003e\u003cp\u003eFrequently Asked Questions\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eWhat is the Sierra 18-99421 MerCruiser Voltage Regulator used for? The Sierra 18-99421 MerCruiser Voltage Regulator is a replacement voltage regulator designed for use with MerCruiser electrical systems. It is listed for specific MerCruiser engine applications ranging from 1976 through 1989, depending on the engine model and configuration.\u003c\/li\u003e\n\u003cli\u003eWhat MerCruiser engines does the Sierra 18-99421 Voltage Regulator fit? The Sierra 18-99421 fits 470 engines with 2 BBL carburetors from 1976-1984, 485 and 488 engines with 2 BBL carburetors from 1980-1984, 170 and 190 engines from 1985-1986, 165 and 180 engines from 1987, and 3.7L engines from 1988-1989.\u003c\/li\u003e\n\u003cli\u003eDoes the Sierra 18-99421 replace CDI 194-9502? Yes. The Sierra 18-99421 Voltage Regulator is listed as interchangeable with CDI 194-9502. This replacement reference can help when comparing the existing voltage regulator or part number before ordering.\u003c\/li\u003e\n\u003cli\u003eWhat Mercury part numbers are interchangeable with the Sierra 18-99421? The Sierra 18-99421 is interchangeable with Mercury 77305A2, 86255A2, 86255A3, 99502A12, 99502A13, 99502A7, 99502A8, and 99502A9. Compare your existing part number and verify the specific engine application before ordering.\u003c\/li\u003e\n\u003cli\u003eIs the Sierra 18-99421 compatible with MerCruiser 3.7L engines? Yes. The application information lists the Sierra 18-99421 for MerCruiser 3.7L engines from 1988-1989. Confirm your engine model and year against the listed application information before using this voltage regulator.\u003c\/li\u003e\n\u003cli\u003eWhat should I verify before ordering the Sierra 18-99421 Voltage Regulator? Verify your MerCruiser engine model, year, and configuration against the listed applications. For the 470, 485, and 488 applications, also confirm the 2 BBL carburetor configuration. Comparing the existing regulator's part number with the listed CDI and Mercury references can provide an additional fitment check.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":50584098636034,"sku":"SIE-18-99421","price":743.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0842\/3024\/2562\/files\/CDI-194-9502_lg__04256.1748445884_29cbd57c-0d34-410e-be46-75a662faac1c.jpg?v=1791100645","url":"https:\/\/allmarineworld.com\/products\/sierra-18-99421-mercruiser-voltage-regulator","provider":"All Marine World","version":"1.0","type":"link"}