Ford Zodiac front and rear turn signal bulbs utilize 1034, 1129, and 1154 sizes depending on production specifications. The replacement chart covers 1955 to 1961 model 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 Ford Zodiac turn signal specifications cover model years 1955 through 1961, with the 1959-1961 entries designated as MK II variants.
The BAY15d bayonet base is the most frequently specified base type across these specifications, appearing in the 1034, 1129, and 1154 bulb types used for the front turn signals.
The 1034 bulb is a dual-filament, 12V, 21/5W ANSI-standard unit with a BAY15d bayonet base, serving as the front turn signal for the Ford Zodiac MK II in 1959-1961.
The 1129 bulb shares the same dual-filament design, BAY15d base, 12V operating voltage, and 21/5W output as the 1034, making both variants of the 1157 bulb family with closely related electrical characteristics.
The 1154 bulb, used in both front and rear positions for the 1955 model year, is rated for both 6V and 12V operation, reflecting an older design intended to accommodate vehicles from either voltage era.
The rear turn signal for the Ford Zodiac MK II (1959-1961) uses the 1073 bulb, which differs fundamentally from the front signal bulb in that it is a single-filament unit with a BA15s bayonet base rather than a dual-filament BAY15d type.
The BA15s base on the 1073 and the BAY15d base on the 1034 are not interchangeable, as the two base types differ in pin alignment and socket design despite both being bayonet-style fittings.
For 1956-1958, both the front and rear turn signal positions share the same 1129 bulb specification, whereas the MK II years use different bulb types for front and rear positions.
The 1073 is a lower-wattage variant of the 1156 bulb family, operating at 12V and 13W, which places it in a distinct wattage class from the 21/5W dual-filament bulbs used in the front positions.
The 1034 and 1129 bulbs are both classified as variants of the 1157 standard, meaning substitution between them may be possible in some applications, though fitment should be confirmed against the specific socket and vehicle wiring.