{"product_id":"ac-gm-signal-flasher-sf-550-12-volt-1-6-lamps","title":"AC GM SIGNAL FLASHER SF 550 12 VOLT 1-6 LAMPS","description":"\u003cp\u003e\u003cspan\u003eThe \u003cstrong\u003eAC Delco SF550\u003c\/strong\u003e is a \u003cstrong\u003emechanical thermal signal flasher\u003c\/strong\u003e designed for \u003cstrong\u003e12‑volt, 1–6 lamp circuits\u003c\/strong\u003e. It uses a bi‑metallic strip that heats and cools to create the rhythmic blink for turn signals and hazard lights.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e AC Delco (GM Genuine Parts)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eModel:\u003c\/strong\u003e SF550\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eGM Part Number:\u003c\/strong\u003e 6450088\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCapacity:\u003c\/strong\u003e 1–6 lamps (heavy‑duty)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTerminals:\u003c\/strong\u003e 2‑prong (standard “L” and “P” configuration)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eConstruction:\u003c\/strong\u003e Metal canister with brass terminals\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eEra:\u003c\/strong\u003e Primarily 1960s–1980s GM production\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan role=\"button\" data-url=\"ca:\/\/s?q=List_all_GM_applications_for_AC_Delco_SF550\" tabindex=\"0\"\u003eCorrect Applications\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis flasher was widely used across GM divisions:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eChevrolet:\u003c\/strong\u003e C\/K trucks, Suburban, Blazer, Camaro, Chevelle, Nova\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eGMC:\u003c\/strong\u003e Pickup, Sierra, Jimmy, Vandura\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePontiac:\u003c\/strong\u003e Firebird, Grand Prix, Catalina\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eBuick:\u003c\/strong\u003e Skylark, LeSabre, Electra\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eOldsmobile:\u003c\/strong\u003e Cutlass, Delta 88, 98\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCadillac:\u003c\/strong\u003e Fleetwood, DeVille\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eGM Heavy‑Duty:\u003c\/strong\u003e School buses, medium‑duty trucks, fleet vehicles\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTypical uses:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eTurn signal flasher\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eHazard warning flasher\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eTrailer‑towing signal circuits\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMulti‑lamp commercial vehicle lighting\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eIf you’re cataloging GM\/Delco parts, this is a classic “workhorse” flasher used in millions of vehicles.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan role=\"button\" data-url=\"ca:\/\/s?q=Explain_value_of_NOS_AC_Delco_parts\" tabindex=\"0\"\u003eCollector \u0026amp; Restorer Value\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eBecause this is \u003cstrong\u003eNOS (New Old Stock)\u003c\/strong\u003e with \u003cstrong\u003eoriginal AC\/GM packaging\u003c\/strong\u003e, it has elevated value for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOEM restorations\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eConcours builds\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePeriod‑correct repairs\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGM memorabilia collectors\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVintage parts dealers\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eNOS electrical components with intact packaging are increasingly rare.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"CorvairFarmer","offers":[{"title":"Default Title","offer_id":49059728457979,"sku":null,"price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0659\/3740\/8251\/files\/aa_a56e5937-3c35-4868-b83c-573165edd270.jpg?v=1783620931","url":"https:\/\/corvairfarmer.com\/products\/ac-gm-signal-flasher-sf-550-12-volt-1-6-lamps","provider":"CorvairFarmer","version":"1.0","type":"link"}