The Jeep J-4600 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-4600 turn signal data, appearing in both front and rear positions across the 1970-1972 model years.
The 1156 follows the ANSI standard for the US and Canada, featuring a single filament and a BA15s bayonet base rated at 12V and 21W.
The 199 bulb, specified for the 1972 Jeep J-4600 front turn signal, shares the same BA15s bayonet base and 12V, 21W electrical rating as the 1156, and is classified as a variant of it.
Despite the electrical and base compatibility between the 199 and 1156, they carry distinct ANSI designations, which indicates they are not unconditionally interchangeable without confirming fitment requirements for the specific position.
The 198 bulb, used in both the front and rear turn signal positions on the 1973 J-4600, is a T5 miniature wedge type rated at 12V and 2W, making it electrically distinct from the 1156 and 199.
The 198 bulb draws significantly less wattage than the 1156 and 199. Substituting a higher-wattage bulb in a socket designed for a 2W load risks exceeding the circuit's thermal and electrical tolerances.
The 198 uses a wedge base rather than a bayonet base, meaning it is physically incompatible with sockets designed for BA15s bayonet-mount bulbs such as those used by the 1156 and 199.
The front turn signal position on the J-4600 used three different bulb types across the 1970-1973 span, with the 1156 in 1970-1971, the 199 in 1972, and the 198 in 1973.
The rear turn signal position on the J-4600 shows a single bulb change across the same span, with the 1156 covering 1970-1972 and the 198 replacing it in 1973.