Oldsmobile Deluxe 88 front and rear turn signal bulbs utilize 1034 and 1154 size specifications. The replacement chart covers 1951 through 1956 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 1034 bulb is an ANSI-standard dual-filament bulb rated at 12V and 21/5W, fitted with a BAY15d bayonet base, and classified as a variant of the 1157.
The 1154 bulb shares the same BAY15d bayonet base and dual-filament construction as the 1034, but is an older variant of the 1157 rated for either 6V or 12V operation.
A BAY15d base features two offset pins at different heights, which physically prevents incorrect insertion and ensures correct filament orientation in the socket.
The dual-filament design of both bulb types allows a single bulb to serve two functions, typically combining a higher-intensity filament for the turn signal with a lower-intensity filament for a secondary lighting role.
The Oldsmobile Deluxe 88 used the 1034 bulb in both the front and rear turn signal positions for the 1953-1956 model years.
For the 1951-1952 model years, both front and rear turn signal positions required the 1154 bulb rather than the 1034.
Although the 1034 and 1154 share the same BAY15d base type, their voltage ratings differ, and substituting one for the other without accounting for the vehicle's electrical system voltage could result in incorrect operation.
The front and rear turn signal positions share identical bulb specifications across all listed model years, indicating a uniform socket type was used throughout the vehicle for those years.