{"product_id":"harddrive-regulator-chrome-xl-1978-1981-oem-74504-78-820-60149","title":"Harddrive Regulator - Chrome XL `1978-1981 OEM 74504-78 — Harley-Davidson Sportster 1000, 1000 Roadster (1980-1981)","description":"\u003cp\u003eHarddrive chrome voltage regulator for Harley-Davidson Sportster XL models 1978–1981, meeting or exceeding OEM 74504-78 specifications. Built with high-power SCR technology and sealed encapsulation for cooler, more reliable operation in heat-prone applications.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eMeets or exceeds OEM specifications\u003c\/li\u003e\n  \u003cli\u003eHigh-power SCR (Silicon Controlled Rectifier) for cooler operation\u003c\/li\u003e\n  \u003cli\u003eSealed, high-temperature encapsulation\u003c\/li\u003e\n  \u003cli\u003eSurface-mount circuit board minimizes thermal impedance\u003c\/li\u003e\n  \u003cli\u003eOEM-grade wiring harness\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Harddrive\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e H0478C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 191361170270\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOEM Reference:\u003c\/strong\u003e 74504-78\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 4.68 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 3.5 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 1.68 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.8 lbs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China (Mainland)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits Harley-Davidson Sportster XL models 1978–1981. Direct replacement for OEM Harley part number 74504-78.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWill this fit my 1982+ Sportster?\u003c\/h3\u003e\n\u003cp\u003eNo — this regulator is specific to 1978–1981 XL models. Later Sportsters use different charging systems.\u003c\/p\u003e\n\u003ch3\u003eWhat does the regulator do?\u003c\/h3\u003e\n\u003cp\u003eIt controls the alternator output voltage to keep your battery charged without overcharging. A failed regulator will leave you stranded or damage electrical components.\u003c\/p\u003e\n\u003ch3\u003eIs this the same as the original Harley part?\u003c\/h3\u003e\n\u003cp\u003eThis Harddrive regulator meets or exceeds OEM 74504-78 specifications and is a direct replacement for the original.\u003c\/p\u003e\n\u003ch3\u003eWhat makes this regulator run cooler?\u003c\/h3\u003e\n\u003cp\u003eThe high-power SCR technology and sealed heat-dissipating encapsulation allow the regulator to operate at lower temperatures than standard designs, improving reliability.\u003c\/p\u003e","brand":"Harddrive","offers":[{"title":"Default Title","offer_id":53035444666479,"sku":"820-60149","price":89.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_b6d1a9c8-1ad0-4551-8f6f-345fc076c841.png?v=1779565531","url":"https:\/\/vtwinbikers.com\/products\/harddrive-regulator-chrome-xl-1978-1981-oem-74504-78-820-60149","provider":"Vtwinbikers","version":"1.0","type":"link"}