The Jeep J10 front side marker requires a 194 or 158 bulb size, while the rear side marker uses a 194 bulb size. The replacement chart covers 1974 through 1988 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 J10 front side marker uses one of two bulb sizes across its model years: the 194 or the 158, both of which are ANSI-standard miniature wedge bulbs rated at 12 volts and sharing the same T10 form factor.
Although the 194 and 158 share the T10 wedge form factor, they are not electrically identical. The 194 draws 3.78 watts while the 158 draws 3 watts, meaning the two are not direct substitutes for one another despite their physical similarity.
The 194 bulb is the predominant front side marker specification for the Jeep J10, covering model years 1974-1982 and 1985-1988.
The 1983-1984 Jeep J10 front side marker position specifies the 158 bulb rather than the 194, representing a departure from the fitment used in surrounding model years.
The rear side marker position on the J10 is specified only for 1983-1984, with both years calling for the 194 bulb.
The T10 wedge base is a tool-free, push-in socket design, meaning bulb replacement in T10-equipped positions requires no special tools for extraction or installation.
Both the 194 and 158 are classified under ANSI standards applicable in the United States and Canada, indicating consistent regulatory compliance across the North American market for these fitments.
At 3.78 watts on a 12-volt circuit, the 194 bulb draws approximately 315 milliamps, while the 158 at 3 watts draws approximately 250 milliamps, a difference relevant to circuit load calculations in the J10's electrical system.