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| Detail | Specification |
| Part Number | 554 (TUNG-SOL Corp.) |
| Part Type | Heavy-Duty Electro-Mechanical Turn Signal Flasher |
| Voltage | 12V |
| Terminals | 2-Pin (Standard Flasher Post Style, typically marked 'X' and 'L') |
| Current Rating | High-Amp Rating, typically 21.0 Amps |
| Lamp Load Capacity | Designed to handle up to 10 Lamps (indicating use on trucks, buses, or vehicles with multiple trailer lamps). |
| Compatible Bulb Type | Incandescent bulbs only (Electro-mechanical flashers do not typically work with LEDs). |
| Application Notes | Used for the Turn Signal function in heavy-duty and commercial applications where the combined wattage of the lamps exceeds the capacity of a standard 552 flasher. |
| Make | Representative Models (Turn Signal Function) | Representative Years |
| Ford | F-Series Trucks (Heavy-Duty Models), Medium-Duty Trucks (F500-F900) | Mid-1960s – Mid-1970s |
| General Motors (GM) | Heavy-Duty C/K Series Trucks, School Buses, Commercial Vans | Mid-1960s – Mid-1970s |
| International Harvester (IH) | Loadstar, Fleetstar, Travelall, Scout (with trailer packages) | ~1960s – 1970s |
| Mopar (Dodge) | D/W Series Heavy-Duty Trucks, Light/Medium Duty Vans | ~1960s – Mid-1970s |
| Commercial/Fleet | Various Buses, Fire Trucks, Dump Trucks, Tow Trucks (Any 12V application requiring 10-lamp capability) | All Years (When specified) |
