AC GM SIGNAL FLASHER SF 550 12 VOLT 1-6 LAMPS

$39.99

type: Unknown Type
Vendor: CorvairFarmer

Description:

The AC Delco SF550 is a mechanical thermal signal flasher designed for 12‑volt, 1–6 lamp circuits. It uses a bi‑metallic strip that heats and cools to create the rhythmic blink for turn signals and hazard lights.

  • Brand: AC Delco (GM Genuine Parts)

  • Model: SF550

  • GM Part Number: 6450088

  • Voltage: 12V

  • Capacity: 1–6 lamps (heavy‑duty)

  • Terminals: 2‑prong (standard “L” and “P” configuration)

  • Construction: Metal canister with brass terminals

  • Era: Primarily 1960s–1980s GM production


Correct Applications

This flasher was widely used across GM divisions:

  • Chevrolet: C/K trucks, Suburban, Blazer, Camaro, Chevelle, Nova

  • GMC: Pickup, Sierra, Jimmy, Vandura

  • Pontiac: Firebird, Grand Prix, Catalina

  • Buick: Skylark, LeSabre, Electra

  • Oldsmobile: Cutlass, Delta 88, 98

  • Cadillac: Fleetwood, DeVille

  • GM Heavy‑Duty: School buses, medium‑duty trucks, fleet vehicles

Typical uses:

  • Turn signal flasher

  • Hazard warning flasher

  • Trailer‑towing signal circuits

  • Multi‑lamp commercial vehicle lighting

If you’re cataloging GM/Delco parts, this is a classic “workhorse” flasher used in millions of vehicles.


Collector & Restorer Value

Because this is NOS (New Old Stock) with original AC/GM packaging, it has elevated value for:

  • OEM restorations

  • Concours builds

  • Period‑correct repairs

  • GM memorabilia collectors

  • Vintage parts dealers

NOS electrical components with intact packaging are increasingly rare.


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