Chevrolet Classic Stepwell Bulb Size

Additional Notes

• The 168 bulb follows the ANSI standard recognized in both the United States and Canada, classifying it as a miniature wedge type in the T10 form factor operating at 12 volts and 4.9 watts.
• The T10 wedge base design means the bulb is held in place by friction from its plastic wedge-shaped base rather than a metal bayonet or screw fitting, which is a common trait of low-wattage interior and courtesy lighting applications.
• At 4.9 watts, the 168 bulb draws a relatively low current, consistent with its role in stepwell illumination where sustained low-level visibility is the primary function rather than high output.
• The Chevrolet Classic uses the 168 bulb size for the stepwell position across its 2004-2005 model years, indicating a consistent fitment specification for that application throughout the production run represented in these records.
• The T10 wedge form factor is shared by several other bulb numbers in the miniature wedge family, meaning physical fitment of an alternate T10 bulb does not guarantee electrical equivalence unless the wattage and voltage ratings also match the 168 specification.