The Dodge C-1 front and rear turn signal bulbs both utilize a 1129 size bulb for proper operation. The replacement chart covers 1954 to 1955 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge C-1 uses the 1129 bulb across both its front and rear turn signal positions for the 1954-1955 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 more than one lighting function 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 signal function and the lower wattage filament handles a secondary function such as running or parking light duty.
The base type is BAY15d, a bayonet-style mount with two offset pins that lock the bulb into its socket with a push-and-turn motion.
The 1129 is described as a variant of the 1157 bulb, which shares the same BAY15d base and dual-filament design but differs in its exact voltage and wattage ratings.
Because the 1129 and 1157 share a base type, physical fitment into a socket designed for one may be possible with the other, though the differing electrical ratings mean they are not direct substitutes without consideration of those values.