Peterbilt 376 Back Up Light Bulb Size

Additional Notes

• The Peterbilt 376 uses the 1156 bulb size across all listed model years for the back up light position, spanning 1988-1999.
• The 1156 is an ANSI-standard bulb recognized in both the United States and Canada, operating at 12 volts and 21 watts with a single filament.
• The BA15s bayonet base on the 1156 features a single contact pin, which distinguishes it from the dual-pin BA15d base found on twin-filament bulbs. These two base types are not interchangeable.
• Because the 1156 is a single-filament bulb, it serves functions requiring only one lighting state, such as reverse illumination, rather than dual-intensity functions like combined stop and tail lighting.
• The 1994 and 1996 Peterbilt 376 each carry two separate entries for the back up light: one general listing and one specific to the configuration with 4 rectangular headlamps, both specifying the 1156 bulb.
• The 1988-1989 model years include a configuration variant noted as having 4 round headlamps, alongside a general entry, with the 1156 bulb specified for both variants in each of those years.
• The 1990 and 1992 model years each list a variant designated as having halogen capsule headlamps, in addition to a general entry, with the 1156 bulb applying to both variants in each year.
• The headlamp configuration notations in the specifications indicate that the 1156 back up light bulb remains consistent regardless of whether the truck was equipped with round, rectangular, or halogen capsule headlamps.