Jeep CJ7 front turn signal bulbs utilize 1034NA and 1157NA sizes, while rear turn signal bulbs use 1157 and 198 sizes. The replacement chart covers 1976 through 1986 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 1157 and 1034NA bulbs are the most frequently specified types across the Jeep CJ7 turn signal positions. Both share the BAY15d bayonet base and dual-filament construction, operating at 12V with a 21W/5W power rating.
The BAY15d bayonet base is a two-pin offset base design. The offset pin placement ensures correct polarity orientation during installation, which is critical for dual-filament bulbs where each filament serves a distinct function.
The 1034NA is a variant of the 1157 and shares its BAY15d base and 12V, 21W/5W rating. The key distinction is its natural amber glass, which produces an amber signal output without relying on a colored lens.
The 1157NA carries the same natural amber glass characteristic as the 1034NA and is likewise rated at 12V, 21W/5W with a BAY15d base. Both "NA" suffix bulbs are ANSI-standardized for the US and Canadian markets.
Because the 1034NA and 1157NA share the same base type and wattage as the clear 1157, physical fitment across these three types is compatible. However, substituting a clear 1157 for an NA-suffix bulb in a position originally specified with amber glass would alter the output color if the housing lens is also clear.
The Jeep CJ7 front turn signal used the 1034NA for model years 1976, 1978, and 1981-1986, while the 1157NA was specified for 1977, 1979-1980, and 1982. This reflects an alternating pattern of two closely related bulb variants across the production run.
The rear turn signal of the Jeep CJ7 transitioned from the 198 bulb, used in 1976-1978, to the 1157, used in 1979-1986. These two bulb types are not interchangeable, as they differ in base type, construction, and wattage.
The 198 is a T5 miniature wedge bulb rated at 12V and 2W, a single-filament design with no base pins. Its wedge construction differs fundamentally from the bayonet base of the 1157, making the two types physically incompatible with each other's sockets.
The significantly lower wattage of the 198 (2W) compared to the 1157 (21W/5W) reflects a difference in light output and circuit load. Substituting one for the other would affect both socket compatibility and the electrical load on the turn signal circuit.
All four bulb types specified for the CJ7 turn signals conform to ANSI standards applicable to the US and Canadian markets, indicating standardized dimensional and electrical tolerances across the range.