Chevrolet Avalanche Luggage Compartment Bulb Size

Additional Notes

• The 921 bulb is the sole luggage compartment bulb size listed across all Chevrolet Avalanche model years in these specifications, covering 2007-2013.
• The 921 is a wedge-type bulb, meaning it uses a plastic wedge base rather than a metal contact pin or bayonet fitting, allowing it to be inserted and removed without a socket rotation.
• The T15 designation refers to the bulb's tubular envelope size, where 15 indicates a width of 15/8 of an inch, making it a relatively compact light source suited to enclosed cargo area applications.
• The 921 operates at 12 volts and 16 watts, which is consistent with standard automotive low-voltage electrical systems and places it in the mid-range of common interior bulb wattages.
• The ANSI standard classification confirms the 921 follows a regulated specification recognized in both the United States and Canada, meaning physical and electrical tolerances are defined by an independent standards body rather than a single manufacturer.
• Because the 921 is an ANSI-standardized wedge bulb, other bulbs sharing the T15 wedge base and rated at 12V/16W may be physically interchangeable, though electrical compatibility should be confirmed against the vehicle's socket rating before substitution.