The Ford F-3 front and rear turn signal bulbs both utilize a 1129 size bulb for proper operation. The replacement chart covers 1950 through 1952 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford F-3 uses the 1129 bulb across both its front and rear turn signal positions for the 1950-1952 model years.
The 1129 is an ANSI-standardized bulb type recognized in both the United States and Canada.
It is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, allowing it to serve two distinct lighting functions at different wattages.
The 1129 operates on a 12-volt electrical system and carries a 21/5W rating, where the higher wattage filament handles the primary turn signal function and the lower wattage filament handles a secondary function such as running or parking light duty.
The base type is a BAY15d bayonet mount, which is an offset dual-contact bayonet fitting designed to ensure the bulb is seated in only one rotational orientation, preventing incorrect filament alignment.
The 1129 is noted as a variant of the 1157, a widely used automotive bulb type, though the two are not necessarily interchangeable due to potential differences in filament wattage, base pin offset, or voltage rating.