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| Feature | Specification |
| Part Number | UN303 (GEC FlashRite) |
| Function | Turn Signal Flasher Relay (Thermal Type) |
| Voltage | 6 Volts (Designed for 6V Electrical Systems) |
| Terminals | 3 Connectors/Prongs (Clip-on style terminals) |
| Bulb Capacity | 2-21 Candlepower Bulbs (2 x 21CP) |
| Interchangeable with | UN302 (Similar flasher, usually with screw terminals) and 229 series flashers. |
| Construction | Metal Canister/Housing (This specific UN303 typically does not include a mounting bracket, unlike the UN302) |
| Typical Use | Turn Signal System (Flasher mechanism) in Vintage Cars and Trucks (6-Volt era). |
| Manufacturer/Designation | Part Number |
| Interchange Part Number | UP229D |
| Manufacturer Alternate | UN302 (Interchangeable, typically screw terminals) |
| Generic Equivalent | Any 6V, 3-Prong (Power, Load, Pilot) Thermal Flasher |
| Vehicle/Truck | Years | Notes |
| Chevrolet (Car & Truck) | 1946 - 1950 | Used where a 6V, 3-prong thermal flasher was installed. |
| GMC (Trucks) | Late 1940s - Early 1950s | Applicable to various 6V GMC truck models. |
| Packard | 1948 - 1949 | Known fitment for various models in these years using 6V. |
| General Motors (Car & Truck) | Late 1940s - Mid-1950s | Fits various 6V GM vehicles requiring a 3-prong (Power, Load, Pilot) turn signal flasher. |
