The Jeep Jeepster front and rear turn signal bulbs utilize either 1156 or 1034 size specifications. The replacement chart covers 1966 through 1971 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 Jeepster uses two distinct bulb types across its model years for both front and rear turn signals: the 1156 and the 1034.
The 1156 is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and is recognized under the ANSI standard in the US and Canada.
The 1034 is a dual-filament bulb rated at 12V with a 21/5W output, fitted with a BAY15d bayonet base, and is also an ANSI-standard bulb. It is a variant of the more widely known 1157.
The BA15s base of the 1156 and the BAY15d base of the 1034 are not interchangeable. The BAY15d base has offset pins to prevent incorrect installation, while the BA15s base has a single contact and symmetrical pins.
Because the 1034 is dual-filament and the 1156 is single-filament, the two types serve different electrical configurations and cannot substitute for one another even if physically forced into a socket.
The Jeep Jeepster transitioned from the 1034 bulb to the 1156 bulb between the 1968 and 1969 model years, affecting both front and rear turn signal positions simultaneously.
Model years 1969-1971 use the 1156 bulb for both front and rear turn signals.
Model years 1966-1968 use the 1034 bulb for both front and rear turn signals.