Peterbilt 379 License Plate Bulb Size

The Peterbilt 379 license plate light uses bulb size 67 and bulb size 97 for illumination. Available information covers the span of time from 1986 through 2007.

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
1998-2007	67
1986-1997	67
1986-1997	97 (With Halogen Capsule Headlamps)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 8W.	67
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	97

Other Locations

Additional Notes

The Peterbilt 379 uses the bulb 67 as its license plate bulb across all specified model years from 1986 to 2007.
The bulb 67 is an ANSI-standard single-filament bulb rated at 12V and 8W, fitted with a BA15s bayonet base, and is classified as a lower wattage variant of the 1156 bulb type.
The bulb 97 is also an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V and 13W, and is likewise a variant of the 1156 type, drawing notably more wattage than the 67.
For the Peterbilt 379 model years 1986-1997, vehicles equipped with halogen capsule headlamps require the bulb 97 rather than the bulb 67 for the license plate position.
From 1998 onward through 2007, the specifications list only the bulb 67 with no conditional fitment variant, indicating the halogen capsule headlamp configuration is not referenced for those years.
Although both the 67 and 97 share the same BA15s bayonet base, their wattage ratings differ by 5W, and the two bulbs are not interchangeable where a specific fitment condition is stated in the specifications.
The dual-bulb fitment entries for 1986-1997 indicate that headlamp system type is a determining factor in selecting the correct license plate bulb for those model years.