{"product_id":"db-electrical-alternator-for-mercruiser-model-120-12v-55a-marine-direct-fit","title":"DB Electrical Alternator for MerCruiser Model 120 — 12V 55A Marine Direct-Fit","description":"\u003cstrong\u003eDB Electrical Alternator 400-46022 is a direct-fit, 12-volt 55-amp replacement engineered to match MerCruiser Model 120 alternators and provide reliable electrical output for compatible marine engines.\u003c\/strong\u003e\n\n\u003cp\u003eIf your boat’s alternator is failing or you want an affordable option that restores charging performance, this DB Electrical unit is built as an OEM-style replacement for a long list of MerCruiser, Mercury Marine and other marine engine models. It’s designed for plug-and-play installation where the original alternator fitment is required, with plated hardware to resist corrosion and an internal regulator and fan chosen for marine duty.\u003c\/p\u003e\n\n\u003ch3\u003eWhich engines and model years will this alternator replace?\u003c\/h3\u003e\n\u003cp\u003eThis DB Electrical alternator covers numerous MerCruiser models and is compatible with a range of other marine manufacturers, including Mercury Marine, OMC, Crusader and Lucas applications. Check the vehicle or engine fit information carefully before purchasing to confirm exact interchange.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacements for MerCruiser Model 120 (1973–1989) and many other MerCruiser model numbers listed in the product description.\u003c\/li\u003e\n  \u003cli\u003eInterchangeable with Mercury Marine, Motorola, OMC, Sierra Marine and similar marine alternators.\u003c\/li\u003e\n  \u003cli\u003eOften used for Lucas and Mando model families from 1985 onward and various OMC and Pleasurecraft models.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the electrical and mechanical specifications?\u003c\/h3\u003e\n\u003cp\u003eThe alternator delivers 12 volts at 55 amps and comes with a V1 class pulley, an internal regulator (IR) and an EF-type cooling fan. These specifications mirror the original alternator’s output and mounting so it operates with the boat’s original charging system without major modification.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVoltage: 12V — compatible with standard marine charging systems.\u003c\/li\u003e\n  \u003cli\u003eRated amperage: 55A — suitable for charging batteries and running onboard electrical loads.\u003c\/li\u003e\n  \u003cli\u003ePulley class: V1; Regulator type: IR; Fan type: EF for proper cooling and belt alignment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable is this alternator in a marine environment?\u003c\/h3\u003e\n\u003cp\u003eDB Electrical builds this unit with plated fans, pulleys and mounting hardware to resist rust and extend service life in corrosive, humid conditions. It’s manufactured to meet common marine safety and performance expectations used for aftermarket alternators.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePlated components reduce corrosion on exposed metal parts.\u003c\/li\u003e\n  \u003cli\u003eInternal regulator and fan chosen for continuous marine operation.\u003c\/li\u003e\n  \u003cli\u003eManufactured as a direct-fit aftermarket substitute to match OEM installation and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I verify before buying to ensure fit and compatibility?\u003c\/h3\u003e\n\u003cp\u003eConfirm engine model number, year and original alternator part number where possible. Use the fitment notes and any confirmed-fit tool on the retailer’s page to verify interchangeability; some listings include additional fit notes indicated by an information icon.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompare your engine’s model and year with the compatibility list in the product description.\u003c\/li\u003e\n  \u003cli\u003eMatch pulley style and mounting configuration to your existing alternator.\u003c\/li\u003e\n  \u003cli\u003eReview confirmed fit notes on the product page to catch application-specific details.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: This DB Electrical 400-46022 alternator is aimed at boat owners, marine mechanics and DIY enthusiasts who need a dependable, cost-effective OEM-style replacement for older MerCruiser and compatible marine engines. It’s ideal when you want a direct replacement that fits original mounting points and restores 12V\/55A charging capacity without sourcing a more expensive brand-new OEM part.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this alternator fit my MerCruiser Model 120?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—this DB Electrical unit is a direct-fit replacement for MerCruiser Model 120 (1973–1989). Confirm your engine year and mounting before buying.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What are the electrical specs of this alternator?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It is a 12-volt alternator rated at 55 amps with a V1 pulley, internal regulator (IR) and EF cooling fan.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"DB Electrical","offers":[{"title":"Default Title","offer_id":67585593376953,"sku":"B00KGIBD5W","price":290.19,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/db-electrical-front-view-alternator.jpg?v=1790473361","url":"https:\/\/redleafauto.ca\/products\/db-electrical-alternator-for-mercruiser-model-120-12v-55a-marine-direct-fit","provider":"Redleaf Auto","version":"1.0","type":"link"}