The Peterbilt 359 uses a 194 bulb size for front side marker applications and an 1816 bulb size for rear side marker applications. The replacement chart covers 1986 to 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 Peterbilt 359 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 miniature wedge bulbs rated for 12-volt automotive electrical systems, making them compatible with the standard 12V architecture found in commercial trucks of that era.
The 194 bulb follows the T10 wedge form factor and draws 3.78 watts, placing it among the lower-wattage bulbs in the miniature wedge category.
The 1816 bulb uses the T3.25 wedge form factor, which is physically smaller in profile than the T10, and draws 4 watts, making it marginally higher in power consumption than the front marker bulb.
Although both bulbs share the same wedge-base design and operate on 12 volts, the T10 and T3.25 form factors are not interchangeable due to differences in their base sizing and housing fitment.
The consistent use of the 194 across all three front side marker positions for 1986-1988 on the Peterbilt 359 indicates a stable, unchanged specification throughout that production window.
The 1816 similarly remains the sole rear side marker specification across the same 1986-1988 range, reflecting no variation in rear marker fitment requirements during that period.
Both bulb types carry ANSI designations valid in the United States and Canada, meaning they conform to a shared North American standardization framework for miniature automotive lighting.