{"product_id":"auto-occasion-voltage-regulator-d663-for-delco-10dn-20dn-12v-negative-ground-direct-fit-replacement","title":"AUTO OCCASION Voltage Regulator D663 for Delco 10DN\/20DN 12V Negative-Ground — Direct-Fit Replacement","description":"\u003cp\u003e\u003cstrong\u003eAUTO OCCASION voltage regulator D663 is a new 12V replacement unit designed to match Delco 10DN\/20DN solid-state negative-ground charging systems for Buick, Cadillac, Chevrolet, GMC, Oldsmobile and Pontiac vehicles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact, direct-fit regulator provides a straightforward replacement for worn or damaged factory regulators on compatible classic and modern GM electrical systems. Manufactured to meet key electrical and mechanical dimensions, the part is intended for 12V negative-ground Delco alternator assemblies and ships new from the factory in China. Before purchase, verify year, make and model compatibility and visually compare the part to your original regulator to ensure correct fitment.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles and alternator types will this regulator fit?\u003c\/h3\u003e\n\u003cp\u003eThe D663 regulator is built for Delco solid-state regulator platforms, commonly referenced as 10DN and 20DN series. It fits a range of GM-built cars and trucks that use these regulator types with a 12V negative-ground electrical system. Always check the original part number and connector style on your vehicle before installing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Delco 10DN and 20DN solid-state regulator housings\u003c\/li\u003e\n  \u003cli\u003eTypical applications: Buick, Cadillac, Chevrolet, GMC, Oldsmobile, Pontiac\u003c\/li\u003e\n  \u003cli\u003eDesigned for 12V negative-ground electrical systems\u003c\/li\u003e\n  \u003cli\u003ePart number reference: D663 — compare to original for visual match\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I confirm this regulator matches my original part?\u003c\/h3\u003e\n\u003cp\u003eConfirming fit is a two-step process: check the listed fitment (years, makes, models) and visually compare the new regulator to your existing unit. Look at the mounting hole spacing, connector type and the regulator's shape to ensure a direct replacement. If any detail differs, the part may not install correctly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify vehicle year, make and model against seller fitment notes\u003c\/li\u003e\n  \u003cli\u003eCompare mounting holes, connector pins and physical dimensions\u003c\/li\u003e\n  \u003cli\u003eMatch the original part number or consult a parts diagram when in doubt\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect during installation and performance?\u003c\/h3\u003e\n\u003cp\u003eInstallation follows the same steps as the original regulator—remove the old unit, install the new regulator in the alternator or voltage regulator housing, and reconnect electrical terminals. Once installed, the regulator controls alternator output to maintain system voltage under normal electrical load. Use basic hand tools and follow vehicle-specific service instructions to avoid damaging connectors or the alternator.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSimple swap-in for visually matching regulators\u003c\/li\u003e\n  \u003cli\u003eRe-establishes voltage regulation for 12V negative-ground systems\u003c\/li\u003e\n  \u003cli\u003eFollow vehicle service manual torque and wiring procedures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the product specifications and origin?\u003c\/h3\u003e\n\u003cp\u003eThe regulator is sold new under the AUTO OCCASION brand with part number D663 and is manufactured in China. It is specified for 12V electrical systems and built as a solid-state replacement component. The listing emphasizes compatibility confirmation to prevent mis-purchases.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProduct type: Voltage regulator, solid-state\u003c\/li\u003e\n  \u003cli\u003eVoltage rating: 12V, negative ground\u003c\/li\u003e\n  \u003cli\u003eCondition: New — Part number D663\u003c\/li\u003e\n  \u003cli\u003eCountry of origin: CN (China)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? This regulator is aimed at DIY mechanics, restoration specialists and professional technicians working on GM vehicles that originally used Delco 10DN\/20DN solid-state regulators. If you need a dependable, direct-fit replacement for a 12V negative-ground alternator regulator and your original part matches D663 or the Delco 10DN\/20DN footprint, this AUTO OCCASION unit is a practical option. If you are unsure, gather the old regulator's part number and photos, or consult a knowledgeable parts supplier to confirm fitment before ordering.\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: Is this regulator compatible with a 12V negative-ground system?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the D663 regulator is designed for 12V negative-ground Delco 10DN\/20DN systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What should I check before purchasing?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Confirm your vehicle's year\/make\/model and visually match the regulator's mounting, connector, and part number to your original unit.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AUTO OCCASION","offers":[{"title":"Default Title","offer_id":48084885569694,"sku":"B0D4Y8LJDP","price":36.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/auto-occasion-regulator-front-view.jpg?v=1785865176","url":"https:\/\/northtrailauto.ca\/products\/auto-occasion-voltage-regulator-d663-for-delco-10dn-20dn-12v-negative-ground-direct-fit-replacement","provider":"North Trail Auto","version":"1.0","type":"link"}