Peterbilt 227 Dome Light Bulb Size

The Peterbilt 227 dome light requires a bulb size of 97 for the interior lighting fixture. Data for the specified component covers the period from 1990 through 1994.

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
1990-1994	97 (With 2 Rectangular Headlamps)

Bulb Specifications

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

Other Locations

Additional Notes

The bulb size 97 is an ANSI-standardized type used in both the United States and Canada, operating at 12 volts and 13 watts.
The 97 bulb uses a BA15s bayonet base, which is a single-contact base with a 15mm collar and a single locating pin to ensure consistent orientation during installation.
As a single-filament bulb, the 97 type serves functions that require only one lighting mode, such as dome illumination, rather than dual-intensity applications like brake and tail combinations.
The 97 bulb is a variant of the 1156, meaning the two types share the same BA15s base family, though they are not necessarily interchangeable due to potential differences in wattage and physical fit.
The Peterbilt 227 used the 97 bulb size for the dome light across the 1990-1994 model years, all under the condition of having 2 rectangular headlamps.
The headlamp configuration noted in the specifications, specifically 2 rectangular headlamps, is a fitment qualifier, indicating that this bulb size applies only to vehicles built with that particular headlamp arrangement.