Peterbilt 378 Courtesy Bulb Size
The Peterbilt 378 courtesy light utilizes 1141, 906, 1004, and P21W bulb sizes for the interior lighting components. Available data for the specified vehicle covers the range from 1988 through 1997.
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
If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.
| Years | US Type | EU Type | Shop |
|---|---|---|---|
| 1997 | 1141 (With 4 Rectangular Headlamps) | 1141 | Check Price |
| 906 (With 4 Round Headlamps) | 906 | Check Price | |
| 1004 (With Halogen Capsule Headlamps) | 1004 | Check Price | |
| 1996 | 1141 (With 4 Rectangular Headlamps) | 1141 | Check Price |
| 1004 (With 4 Round Headlamps) | 1004 | Check Price | |
| 1156 (With Halogen Capsule Headlamps) | P21W | Check Price | |
| 1995 | 1141 | 1141 | Check Price |
| 1004 (With 4 Round Headlamps) | 1004 | Check Price | |
| 1994 | 1141 | 1141 | Check Price |
| 1004 (With 4 Rectangular Headlamps) | 1004 | Check Price | |
| 1993 | 1141 (With 4 Rectangular Headlamps) | 1141 | Check Price |
| 1004 (With 4 Round Headlamps) | 1004 | Check Price | |
| 1156 (With Halogen Capsule Headlamps) | P21W | Check Price | |
| 1992 | 1141 | 1141 | Check Price |
| 1991 | 1141 (With 4 Rectangular Headlamps) | 1141 | Check Price |
| 906 (With 4 Round Headlamps) | 906 | Check Price | |
| 1004 (With Halogen Capsule Headlamps) | 1004 | Check Price | |
| 1990 | 1004 (With 4 Rectangular Headlamps) | 1004 | Check Price |
| 906 (With 4 Round Headlamps) | 906 | Check Price | |
| 1141 (With Halogen Capsule Headlamps) | 1141 | Check Price | |
| 1989 | 1004 | 1004 | Check Price |
| 1141 (With Halogen Capsule Headlamps) | 1141 | Check Price | |
| 1988 | 1004 (With 4 Rectangular Headlamps) | 1004 | Check Price |
| 906 (With 4 Round Headlamps) | 906 | Check Price | |
| 1141 (With Halogen Capsule Headlamps) | 1141 | Check Price |
Bulb Specifications
| Description | Type | Shop |
|---|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1141 | Check Price |
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W. | 906 | Check Price |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1004 | Check Price |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W | Check Price |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1156 | Check Price |