The Jeep J-3700 front turn signal bulb accommodates 3 distinct sizes including 199, 1156, and 1034, while the rear turn signal bulb uses either 1156 or 1034 sizes. The replacement chart covers 1965 to 1970 vehicle production 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 1034 bulb is the most frequently specified type across the Jeep J-3700 turn signal positions, covering both front and rear applications for the 1965-1968 model years.
The 1034 is a dual-filament bulb rated at 12V and 21/5W, meaning it carries two separate filaments operating at different wattages within a single housing, a design that typically supports combined signaling and running light functions.
The 1034 uses a BAY15d bayonet base, which features two offset pins at different heights to prevent incorrect installation, distinguishing it physically from single-filament bayonet types.
The 1034 is classified as a variant of the 1157 under the ANSI standard shared across the United States and Canada.
For the 1969 model year, the Jeep J-3700 front and rear turn signals both use the 1156, a single-filament bulb rated at 12V and 21W with a BA15s bayonet base.
The 1970 model year introduces a split specification: the front turn signal uses the 199, while the rear retains the 1156.
The 199 and 1156 share the same BA15s bayonet base and identical 12V, 21W ratings, as the 199 is an ANSI-recognized variant of the 1156.
Despite the electrical and base similarities between the 199 and 1156, they are catalogued as distinct part numbers under the ANSI standard, and substitution between them warrants verification against the specific socket and housing of the application.
The transition from the dual-filament 1034 to the single-filament 1156 between the 1968 and 1969 model years represents a change in filament configuration across both front and rear turn signal positions on the Jeep J-3700.
All three bulb types specified for the Jeep J-3700 turn signals conform to ANSI standards recognized in both the United States and Canada.