The Jeep J-4500 front turn signal uses bulb sizes 198, 1156, or 199, while the rear turn signal requires either 198 or 1156 size bulbs. The replacement chart covers 1970 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 Jeep J-4500 turn signal bulb specifications cover the 1970-1973 model years across both front and rear positions.
The 1156 is the most frequently specified bulb across these positions and years. It is an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 21W.
The 199 bulb shares the same BA15s bayonet base, voltage, and wattage as the 1156 and is classified as a variant of it. Both carry ANSI recognition in the US and Canada.
The 198 is a T5 miniature wedge bulb rated at 12V and 2W, making it substantially lower in wattage than the 1156 and 199. It is not interchangeable with either of those types due to its different base design and power rating.
For the 1973 Jeep J-4500, both the front and rear turn signals specify the 198 bulb, a departure from the 1156 used in prior years for those positions.
The 1971 front turn signal specifies the 199 bulb, while the rear turn signal for that same year specifies the 1156. Although both share the BA15s bayonet base and identical electrical ratings, they are listed as distinct part numbers and should not be assumed to be identical replacements without verification.
The 1970 and 1972 model years specify the 1156 for both front and rear turn signal positions, making the 1156 the sole bulb type required across all four positions in those years.