Peterbilt 385 front turn signal bulbs use 2057 size, while rear turn signal bulbs use either 2057 or 198 size depending on configuration. The replacement chart covers vehicle production spanning 1995 to 2008 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 2057 bulb is the dominant turn signal bulb across the Peterbilt 385, serving both front and rear turn signal positions throughout the 1995-2008 model range.
The 2057 is a dual-filament bulb operating at 12 volts with a BAY15d bayonet base, drawing 26.9 watts on its high-intensity filament and 8 watts on its low-intensity filament.
As an ANSI-standardized bulb recognized in both the United States and Canada, the 2057 is a brighter variant of the 1157, sharing the same BAY15d base type.
The 198 bulb appears in rear turn signal positions on the Peterbilt 385 for select model years and headlamp configurations, operating at 12 volts and drawing only 2 watts.
The 198 is a miniature wedge bulb of the T5 type, which is physically and electrically distinct from the 2057 and the two are not interchangeable.
On the 1997 Peterbilt 385, the rear turn signal uses the 198 bulb as the standard fitment, while trucks equipped with four round headlamps use the 2057 instead, indicating that headlamp configuration determines the correct rear bulb for that year.
On the 1996 model, the rear turn signal similarly splits between bulb types: the 198 applies to trucks with four rectangular headlamps, while the 2057 applies to the remaining configuration.
The 1995 Peterbilt 385 rear turn signal follows the same conditional pattern, with the 198 specified for trucks fitted with four round headlamps and the 2057 for the standard configuration.
Front turn signal fitment on the Peterbilt 385 carries no conditional variations across any model year in the 1995-2008 range, with the 2057 specified uniformly regardless of headlamp type.
Because the 198 and 2057 differ in base type, wattage, and filament count, confirming the headlamp configuration on 1995-1997 models is necessary before selecting a rear turn signal bulb.