AC Delco SF552 Heavy‑Duty 12‑Volt Flasher is a GM‑original 2‑terminal thermal flasher

$34.99

type: Unknown Type
Vendor: CorvairFarmer

Description:

AC Delco SF552 Heavy‑Duty 12V Signal Flasher (NOS, Boxed)

The metal canister is stamped SF 552 – 12 VOLT FLASHER, and the box identifies it as:

  • AC Signal Flasher – Heavy Duty

  • GM Part Number: 6450089

  • Lamp Capacity: 1–6 lamps

  • Terminals: 2‑prong (L = Load, P = Pilot)

  • Manufacturer: AC Delco / GM General Motors Corporation

  • Era: 1960s–1980s

This is the heavy‑duty version of the standard GM 552 flasher, designed to handle higher lamp loads and trailer circuits.


🚗 Correct GM Applications

The SF552 fits nearly all GM vehicles using a 2‑terminal flasher, including:

GM Passenger Cars

  • Chevrolet: Camaro, Chevelle, Nova, Impala, Caprice

  • Pontiac: Firebird, Grand Prix, Catalina

  • Buick: Skylark, LeSabre, Electra

  • Oldsmobile: Cutlass, Delta 88, 98

  • Cadillac: Fleetwood, DeVille

GM Trucks & Commercial

  • Chevy C/K pickups

  • Suburban

  • Blazer

  • GMC Sierra / Jimmy

  • GM medium‑duty trucks

  • GM fleet vehicles

Typical Uses

  • Turn‑signal flasher

  • Hazard flasher

  • Trailer‑towing multi‑lamp circuits

  • Commercial multi‑lamp signal systems

Genuine AC Delco SF552 heavy‑duty flasher, GM part 6450089, correct for 1960s–1980s GM cars and trucks. Rated for 1–6 lamps, ideal for turn signals, hazards, and trailer‑towing circuits.

Features: • OEM AC Delco / GM part • Heavy‑Duty 12V flasher • Supports multi‑lamp circuits • Perfect for GM restorations and concours builds • NOS condition with original GM packaging