The Jeep J-4800 front and rear turn signal bulbs utilize 198, 1156, or 199 size specifications. The replacement chart covers 1970 through 1973 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Jeep J-4800 turn signal bulb specifications cover the 1970-1973 model years across both front and rear positions.
Three distinct bulb types appear in these specifications: the 198, 1156, and 199, all of which conform to ANSI standards recognized in both the United States and Canada.
The 1156 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W. It is among the most widely used automotive turn signal bulbs of its era.
The 199 shares the same BA15s bayonet base, 12V supply voltage, and 21W power rating as the 1156, and is classified as a variant of that bulb type.
Despite their electrical and mechanical similarities, the 1156 and 199 are listed as separate part numbers, and their positions on the J-4800 are not interchangeable across all model years without confirming the specific year and location.
The 198 is a miniature wedge bulb of the T5 form factor, rated at 12V and only 2W, making it substantially lower in wattage than the 1156 and 199 used elsewhere in the same vehicle.
The low wattage of the 198 bulb reflects its wedge-base construction, which is physically and electrically incompatible with the BA15s bayonet socket used by the 1156 and 199.
For the 1973 Jeep J-4800, the 198 bulb is specified for both the front and rear turn signal positions, representing the only model year in these specifications where both positions share the same bulb type.
The front and rear turn signal positions do not consistently use the same bulb type across the 1970-1972 model years, as the 1156 and 199 alternate between positions depending on the year.