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| Feature | Specification |
| Part Number | 143S4S (Tung-Sol) |
| Function | Signal Flasher Relay (Thermal Type) |
| Voltage | 6 Volts (Designed for 6V Electrical Systems) |
| Terminals | 2 Screw Terminal Connectors (L and P or X and L style typical) |
| Bulb Capacity | Designed to operate two (2) turn signal lamps. |
| Construction | Metal Canister/Housing |
| Typical Use | Turn Signal System (Flasher mechanism) in Vintage Cars, Trucks, and Aircraft (Fixed Wing) |
| Vehicle/Truck | Years | Notes |
| Vintage Automobiles | Approx. 1930s - Mid-1950s | Used in various passenger cars with a 6-volt electrical system and a 2-bulb turn signal setup. |
| Vintage Trucks | Approx. 1930s - Mid-1950s | Used in various light and heavy-duty trucks with a 6-volt electrical system and a 2-bulb turn signal setup. |
| Fixed Wing Aircraft | Vintage Aviation (e.g., Beechcraft Bonanza M35) | Used for specialized indicator or signal functions (Confirmed alternate usage). |
