The Peterbilt 200 front turn signal bulb accommodates 2057, 198, and 199 sizes, while the rear turn signal bulb uses 2057 and 198 sizes. The replacement chart covers vehicle production years spanning 1974 to 2000 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 most frequently specified size across the Peterbilt 200 turn signal data, appearing in both front and rear positions for model years 1993-2000.
The 2057 is a dual-filament bulb rated at 12V with a BAY15d bayonet base, drawing 26.9W on its brighter filament and 8W on its secondary filament. It is an ANSI-standard type recognized in both the US and Canada.
The 198 bulb is a miniature wedge type rated at 12V and 2W, classified under the T5 form factor. Despite sharing the same ANSI-standard designation as the 2057, the two bulbs are not interchangeable due to differences in base type, wattage, and filament count.
The 199 bulb is a single-filament type with a BA15s bayonet base, rated at 12V and 21W. It is a variant of the 1156 and differs from the 2057, which uses a BAY15d base. The offset pins on the BAY15d base prevent a 2057 from seating in a BA15s socket, making the two physically incompatible.
For the Peterbilt 200, the 199 bulb applies exclusively to the front turn signal on City Delivery units from 1974-1978.
The 198 bulb appears in the rear turn signal position for City Delivery units from 1974-1978, while the front turn signal on those same units uses the higher-wattage 199 bulb. The two positions therefore require different bulbs on that configuration.
On 1996-1997 front turn signal applications, the Peterbilt 200 with 4 Round Headlamps uses the 198 bulb rather than the 2057 specified for standard configurations of the same years.
The rear turn signal on the 1993 Peterbilt 200 with 4 Round Headlamps calls for the 198 bulb, while the standard 1993 configuration uses the 2057, indicating that headlamp configuration directly affects rear bulb selection in that year.
A reversal occurs between the 1995 rear turn signal entries: the standard configuration uses the 198 bulb, while the 4 Round Headlamps configuration uses the 2057. This is the opposite relationship seen in 1993 and 1996, where the 4 Round Headlamps variant takes the 198.
The 2057 is described as a brighter variant of the 1157, sharing the same BAY15d base. However, the two are not confirmed as interchangeable within these specifications, and wattage differences between them may affect compatibility with original sockets and circuits.