The Jeep J-2500 front and rear turn signal bulb sizes include 198, 1156, and 199 options. The replacement chart covers 1965 through 1973 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 J-2500 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, using a BAY15d bayonet base. Its dual-filament design allows it to serve two lighting functions within a single housing, which distinguishes it from the single-filament types also found in these specifications.
The 1034 is classified as a variant of the 1157 bulb under the ANSI standard. While the two types share a close relationship, they are not confirmed as interchangeable within these specifications, and substituting one for the other without verification carries a fitment risk.
The 1156 bulb appears in both front and rear turn signal positions across multiple model years. It is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The 199 bulb shares the same voltage rating, wattage, and BA15s bayonet base as the 1156, and is classified as a variant of it under the ANSI standard. Despite this relationship, the two are listed separately in the J-2500 specifications, indicating they are not treated as direct drop-in replacements.
The front and rear turn signal positions do not always share the same bulb type within a given model year. In 1969, for example, the front position calls for a 1156 while the rear requires a 199, making position-specific confirmation necessary before installation.
The 1973 Jeep J-2500 specifies the 198 bulb for both front and rear turn signal positions. The 198 is a miniature wedge-base bulb of the T5 form factor, rated at 12V and only 2W, which represents a substantially lower wattage than all other bulb types listed in these specifications.
The T5 wedge base of the 198 bulb is physically incompatible with the BAY15d and BA15s bayonet bases used by the other bulb types in these specifications. The 198 cannot be fitted into sockets designed for bayonet-base bulbs.
All four bulb types in these specifications conform to ANSI standards recognized in both the United States and Canada, placing them within a standardized North American classification system.
The 1970 model year presents a split specification: the front turn signal uses the 199 while the rear uses the 1156. Both share the same BA15s base and 21W rating, yet they remain distinct part numbers under the ANSI classification.