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| Detail | Specification |
| Part Number | 537 (TUNG-SOL Corp.) |
| Part Type | Vintage Heavy-Duty Thermal Hazard/Turn Signal Flasher |
| Voltage | 12V |
| Terminals | 3-Pin (Standard Flasher Post Style: X=Power, L=Load, P=Pilot/Indicator) |
| Load Type | Thermal Flasher (Compatible with Incandescent bulbs only) |
| Lamp Load Capacity | Heavy-Duty rating, typically handling 3 to 6 incandescent lamps (e.g., 2 turn signal lamps plus 2 tail lamps for hazard, and the indicator lamp). |
| Application Notes |
Primarily used for the Hazard Warning Flasher socket (not the turn signal socket, which is often 2-pin) on domestic cars and trucks |
| Make | Representative Models (Hazard Flasher Function) | Representative Years |
| General Motors (GM) | Full-Size Cars (Impala, Delta 88, LeSabre, Eldorado), Camaros, Firebirds, Chevelles, and C/K Series Trucks | ~1960s – Mid-1970s |
| Ford / Mercury | Full-Size Cars (LTD, Galaxie, Marquis), Mustang, Cougar, and F-Series Trucks | ~1960s – Mid-1970s |
| Chrysler / Mopar | Plymouth, Dodge, Chrysler Full-Size and Mid-Size cars (Coronet, Fury, Charger, Dart) | ~1960s – Mid-1970s |
