Jeep Willys front and rear turn signal bulbs utilize 1034, 1154, or 1158 size specifications. The replacement chart covers 1950 through 1958 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Jeep Willys turn signal specifications cover model years 1950 through 1958, spanning both front and rear positions across nine model years.
Three distinct bulb types appear across these specifications: the 1034, 1154, and 1158, all of which are ANSI-standardized dual-filament bulbs sharing the BAY15d bayonet base.
The BAY15d bayonet base is a two-pin offset base, where the two pins are positioned at different heights to ensure correct polarity orientation during installation.
The 1154 bulb is the most frequently specified type in the Jeep Willys turn signal data, covering both front and rear positions for model years 1951 through 1957.
The 1154 is described as an older variant of the 1157 and is rated for either 6V or 12V operation, reflecting the transitional electrical system voltages common in vehicles of that era.
The 1034 bulb, specified for both front and rear positions on the 1958 Jeep Willys, is also a variant of the 1157 and carries a 12V, 21/5W rating, with the two wattage values corresponding to its high and low filaments respectively.
The 1158 bulb, specified for both front and rear positions on the 1950 Jeep Willys, is rated at 12V and shares the same BAY15d base as the other bulbs in these specifications.
Although the 1034, 1154, and 1158 all share the BAY15d bayonet base, they are not confirmed as interchangeable, as voltage ratings and filament wattages differ between types.
The 1154 and 1034 are both identified as variants of the 1157, but the 1154 carries a dual voltage rating while the 1034 is strictly 12V, which is a relevant distinction for vehicles with 6V electrical systems.
Front and rear turn signal bulb sizes are identical for each model year across the entire 1950 through 1958 range in these specifications.