Tung‑Sol / Wagner 550 Heavy‑Duty 12V Flasher (NOS, Boxed)

Description:

TUNG‑SOL — FLASHER 550 — 12 VOLT — PAT. NO. 3218415 — MADE IN U.S.A. — USE WITH 14A FUSE

This tells us:

• Model: 550

• Voltage: 12V

• Type: Heavy‑duty thermal flasher

• Terminals: 2‑prong

• Fuse requirement: 14‑amp inline fuse

• Patent: 3218415 (thermal cycling mechanism)

• Branding: Tung‑Sol (manufacturer), Wagner (distributor)

Wagner distributed Tung‑Sol flashers widely in the 1960s–1970s, so dual‑brand packaging is period‑correct and desirable.

Why the 550 matters

Compared to the common 552:

• Higher load capacity

• More stable blink rate under towing or multi‑lamp circuits

• Better heat tolerance

• Preferred in commercial and fleet vehicles

The 550 was Tung‑Sol’s “premium heavy‑duty” offering — the one you’d use for trucks, trailers, and hazard circuits with multiple bulbs.

🚗 Vehicle & equipment compatibility

Because it’s a universal 2‑terminal 12V flasher, the 550 fits nearly everything from the 1960s–1990s:

Passenger cars

• Chevrolet: Camaro, Chevelle, Nova, Impala

• Ford: Mustang, Fairlane, LTD

• Chrysler: Dart, Valiant, Fury

• AMC: Hornet, Javelin, Gremlin

Trucks & SUVs

• Chevy C/K series, Suburban, Blazer

• Ford F‑Series, Bronco

• Dodge D‑Series, Ramcharger

• International Harvester pickups & Scouts

Specialty & equipment

• Utility trailers

• RVs

• Farm tractors

• Construction equipment

• Aftermarket wiring harnesses

If it blinked a turn signal or hazard light in a 12‑volt system, the 550 fits.