Peterbilt 567 Side Marker Bulb Size

The Peterbilt 567 side marker utilizes a 3157 bulb size for the lighting components located on the exterior of the vehicle. Data for the specified lighting covers the range from 2017 through 2020.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2017-2020	3157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157

Other Locations

Additional Notes

The Peterbilt 567 uses the 3157 bulb for its side marker application across the 2017-2020 model years.
The 3157 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard shared across the United States and Canada.
The 3157 is a dual-filament bulb, which means it contains two separate filaments within a single housing, each operating at a different wattage: 27W for the higher-intensity filament and 7W for the lower-intensity filament.
The T25 designation refers to the bulb's wedge-base form factor, a common automotive base type that seats directly into a socket without a separate metal base or bayonet pins.
The 3157 operates on a 12-volt electrical system, consistent with standard automotive DC voltage found in most commercial and light-duty vehicles.
Because the 3157 is a dual-filament type, substituting it with a single-filament equivalent such as the 3156 would result in the loss of one lighting function, making direct replacement with the correct bulb type necessary for proper operation.