The Jeep M151 front and rear turn signal bulb sizes include 1156, 199, and 1034 specifications. The replacement chart covers vehicle production years spanning 1965 to 1972.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Jeep M151 uses three distinct bulb types across its front and rear turn signal positions: the 1156, 199, and 1034, all of which conform to ANSI standards recognized in the United States and Canada.
The 1034 is the most consistently specified bulb across the M151's model years, appearing in both front and rear turn signal positions from 1965-1968.
The 1034 is a dual-filament bulb rated at 12V and 21/5W, mounted on a BAY15d bayonet base, and is classified as a variant of the 1157. The dual-filament design allows a single bulb to serve two lighting functions at different wattages.
The 1156 and 199 are both single-filament bulbs rated at 12V and 21W, each using a BA15s bayonet base. The BA15s base is a single-contact bayonet fitting, which is physically distinct from the dual-contact BAY15d base used by the 1034.
Because the BA15s and BAY15d bases differ in their contact configurations, the 1034 is not interchangeable with the 1156 or 199, even though all three share a similar physical profile.
The 199 is specified as a variant of the 1156. Both share identical voltage, wattage, and base type, though they carry separate ANSI designations.
For the Jeep M151, the front turn signal position transitioned from the 1034 in 1965-1968 to the 199 in 1969-1970, and then to the 1156 in 1971-1972, reflecting three distinct bulb specifications across the production span covered.
The rear turn signal position on the M151 does not follow the same year-to-year bulb progression as the front. In 1969, the rear uses the 1156, while the front uses the 199, meaning the front and rear positions require different bulbs in that model year.
A similar front-to-rear mismatch occurs in 1972, where the front turn signal takes the 1156 and the rear takes the 199. Substituting one for the other in these years would be incorrect despite their shared electrical ratings.
In 1965-1968 and 1970, the front and rear turn signal positions share the same bulb specification, whereas in 1969, 1971, and 1972, the two positions call for different bulbs.