The Jeep J-4700 front turn signal bulb accommodates 3 different sizes including 198, 199, and 1156, while the rear turn signal bulb size options consist of 198 and 1156. The replacement chart covers vehicle production years spanning 1970 to 1973.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1156 bulb is the most frequently specified type across the Jeep J-4700 turn signal data, appearing in both front and rear positions across multiple model years.
The 1156 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W, and conforms to ANSI standards for the US and Canadian markets.
The 199 bulb, specified for the 1972 Jeep J-4700 front turn signal, shares the same BA15s bayonet base, voltage, and wattage rating as the 1156, and is classified as a variant of it.
Despite the electrical and mechanical similarities between the 199 and 1156, they are listed as distinct part numbers, and their interchangeability is not confirmed by the specifications.
The 198 bulb, specified for the 1973 front and rear turn signals, is a miniature wedge type in a T5 form factor, rated at 12V and only 2W, making it substantially lower in wattage than the 1156 and 199.
The T5 wedge base of the 198 is physically incompatible with the BA15s bayonet base used by the 1156 and 199, meaning these bulb types are not interchangeable regardless of voltage rating.
For the 1970-1971 model years, both the front and rear turn signals share the same 1156 specification, indicating a consistent bulb type across positions in those years.
The 1972 model year is the only one in the data where the front and rear turn signals use different bulb types, with the front requiring a 199 and the rear requiring a 1156.
All three bulb types in the specifications conform to ANSI standards applicable to both the United States and Canada.
The shift to the 198 wedge bulb for both front and rear positions in 1973 represents a move to a significantly lower wattage rating compared to all prior model years in the data.