Jeep CJ6 front and rear turn signal bulbs utilize 1157NA, 198, 1156, and 199 sizes depending on location and model variation. The replacement chart covers 1959 to 1975 production years with corresponding bulb size 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 CJ6 turn signal data, covering both front and rear positions from 1959-1968. It is a dual-filament bulb with a BAY15d bayonet base rated at 12V and 21/5W, and it is classified as a variant of the 1157.
The BAY15d bayonet base found on the 1034 features offset pins, which prevents incorrect insertion and distinguishes it from the single-pin BA15s base used on other bulbs in these specifications.
The 1157NA, specified for the Jeep CJ6 front turn signal in 1974-1975, shares the same BAY15d bayonet base and 21/5W dual-filament configuration as the 1034, but its natural amber glass distinguishes it as a physically different part despite the electrical similarities.
Because the 1157NA produces its amber color through tinted glass rather than a colored lens, substituting a standard 1157 in its place would alter the color output of the front turn signal on 1974-1975 applications.
The 1156 and 199 bulbs are both single-filament types with BA15s bayonet bases rated at 12V and 21W, with the 199 classified as a variant of the 1156. Their shared base type and wattage indicate a degree of interchangeability, though variant designations can reflect minor differences in filament position or envelope shape.
The 198 is a miniature wedge bulb of the T5 type rated at only 2W, making it substantially lower in output than every other bulb type in these specifications. Its use in the rear turn signal position for 1973-1975 and the front turn signal position for 1973 represents a significant departure from the higher-wattage bulbs used in surrounding years.
The single-filament construction of the 1156 and 199 bulbs means they serve only one lighting function per socket, whereas the dual-filament 1034 and 1157NA can serve two functions, such as combined turn signal and running light duties, within a single housing.
All five bulb types in these specifications conform to ANSI standards applicable to both the United States and Canada, indicating consistent regulatory compliance across the full model range covered.
The front and rear turn signal positions do not consistently share the same bulb type within a given model year. For example, in 1971 the front position uses a 1156 while the rear uses a 199, and in 1973 the front uses a 198 while the rear also uses a 198, showing that socket compatibility between front and rear varied across the production run.
The BAY15d base used by the 1034 and 1157NA differs from the BA15s base used by the 1156 and 199, meaning bulbs from these two groups are not physically interchangeable despite sharing the same 12V operating voltage.