Peterbilt 377 Courtesy Bulb Size
The Peterbilt 377 courtesy light utilizes unique bulb sizes 1004, 1141, 906, and P21W to provide illumination for the interior cabin area of the heavy duty truck. Available data for the specified lighting components spans a range from 1987 through 1997 to assist with identifying the correct replacement for the vehicle.
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 |
|---|---|
| 1997 | P21W |
| 1004 (With 4 Round Headlamps) | |
| 1996 | 1141 |
| 1995 | 1004 |
| 1141 (With Halogen Capsule Headlamps) | |
| 1994 | 1141 (With 4 Rectangular Headlamps) |
| 906 (With 4 Round Headlamps) | |
| P21W (With Halogen Capsule Headlamps) | |
| 1993 | 1141 |
| 1004 (With 4 Round Headlamps) | |
| 1992 | P21W |
| 906 (With 4 Round Headlamps) | |
| 1991 | 1004 |
| 1141 (With 4 Rectangular Headlamps) | |
| 1990 | 1004 |
| 1141 (With 4 Round Headlamps) | |
| 1989 | 1141 |
| 1988 | 1004 |
| 1141 (With 4 Round Headlamps) | |
| 1987 | 1141 |
| 1004 (With 4 Round Headlamps) |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1004 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1141 |
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W. | 906 |