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| Detail | Specification |
| Part Number | N221-12V (SIGNAL-STAT Corp.) |
| Part Type | Vintage 3-Pin Hazard Warning/Turn Signal Flasher |
| Voltage | 12V |
| Terminals | 3-Pin (Standard Flasher Post Style: X=Power, L=Load, P=Pilot/Indicator) |
| Load Type | Thermal or Electro-Mechanical (Compatible with Incandescent bulbs only) |
| Lamp Load Capacity | Typically rated for Hazard Warning load (4-6 exterior lamps plus indicator). It handles the higher load of all four corners flashing simultaneously. |
| Application Notes | Primarily used for the Hazard Warning Flasher socket on vehicles (or very early $12\text{V}$ systems that used a 3-pin unit for the turn signal). The part number N221 is often superseded by or cross-referenced with the industry-standard 537 (3-pin) flasher. |
| Make | Representative Models (Hazard Flasher Function) | Representative Years |
| General Motors (GM) | Impala, Chevelle, Camaro, C/K Series Trucks, Blazers, G-Series Vans | Mid-1960s – Mid-1970s |
| Ford / Mercury | F-Series Trucks, Econoline Vans, Mustang, Cougar, LTD | Mid-1960s – Mid-1970s |
| Chrysler / Mopar | Dodge Trucks (D Series), Challenger, Barracuda, Charger | Mid-1960s – Mid-1970s |
| AMC / Jeep | Ambassador, Javelin, CJ Series Trucks/SUVs | Mid-1960s – Mid-1970s |
