Peterbilt 353 front side marker bulbs measure 194 in size while rear side marker bulbs measure 1816, with each bulb type specified for optimal replacement. The replacement chart covers 1986 to 1988 production years and details bulb size specifications for side marker applications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Peterbilt 353 uses two distinct bulb types across its side marker positions for the 1986-1988 model years: the 194 at the front and the 1816 at the rear.
Both the 194 and 1816 are ANSI-standardized bulbs recognized across the United States and Canada, meaning they conform to a shared North American specification framework.
The 194 bulb is a T10 miniature wedge type, operating at 12 volts with a power draw of 3.78 watts, and serves as the front side marker bulb on the Peterbilt 353.
The 1816 bulb is a T3.25 miniature wedge type, operating at 12 volts with a power draw of 4 watts, and serves as the rear side marker position on the same vehicle.
Although both bulbs share a wedge base design, the T10 and T3.25 designations refer to different physical envelope sizes, which means the 194 and 1816 are not interchangeable with each other despite their similar construction style.
The T10 designation of the 194 bulb indicates a tubular glass envelope roughly 10 eighths of an inch wide, while the T3.25 designation of the 1816 indicates a narrower envelope at 3.25 eighths of an inch, making the rear bulb physically smaller in profile.
The wattage difference between the two bulbs is marginal, with the rear 1816 drawing 4 watts compared to the front 194 at 3.78 watts, reflecting a minor variation in luminous output between the two positions.
The wedge base design on both bulbs means neither requires a separate metal base or bayonet fitting; the glass envelope itself acts as the retention mechanism within the socket.