The Peterbilt 330 uses 193 and 194 bulb sizes for front side marker applications, while rear side marker positions require 1816 bulb size. Replacement chart data spans from 1995 through 2017 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Peterbilt 330 front side marker position uses two distinct bulb sizes across its model years, with the 194 bulb fitted from 1995-2009 and the 193 bulb fitted from 2011-2017.
Both the 193 and 194 bulbs share the same T10 miniature wedge form factor, 12V operating voltage, and 3.78W power rating, making them electrically and physically near-identical despite carrying different ANSI designations.
Because the 193 and 194 are both T10 wedge bulbs with identical voltage and wattage ratings, the change in designation between the earlier and later front side marker years does not reflect a difference in physical size or electrical output.
The rear side marker position on the Peterbilt 330 uses the 1816 bulb for the 1995-1997 model years.
The 1816 bulb follows a T3.25 miniature wedge form factor, which is physically distinct from the T10 form factor used in the 193 and 194 front side marker bulbs, meaning the front and rear side marker bulbs are not interchangeable.
The 1816 bulb operates at 12V and draws 4W, a slightly higher wattage than the 3.78W rating of the T10 bulbs used in the front side marker positions.
All three bulb types listed across the Peterbilt 330 side marker specifications conform to ANSI standards applicable in both the United States and Canada.
All three bulbs use a wedge-style base, which requires no locking mechanism or twist to seat, relying instead on socket tension to hold the bulb in place.