GMC C1500 Dome Light Bulb Size

Additional Notes

• The GMC C1500 uses the 211-2 bulb size for the dome light across all model years listed in the specifications, spanning 1979-1999.
• The 211-2 is a festoon-style bulb, meaning it is cylindrical in shape and mounts by pressing between two spring clips rather than inserting into a socket.
• The 211-2 bulb follows the ANSI standard, indicating it meets a defined specification recognized in both the United States and Canada.
• The bulb operates at 12 volts and 12 watts, which is consistent with standard automotive electrical systems.
• The 211-2 uses an SV8.5 base, a designation that refers to the festoon cap size and is used to classify compatibility with specific lamp holders.
• The 211-2 has a 41mm length, which is the physical span the bulb occupies between its two end caps when seated in a festoon holder.
• Because the 211-2 is an ANSI-standardized bulb, equivalent bulbs from different manufacturers sharing the same designation are generally interchangeable, provided they match the 41mm length and SV8.5 base.
• The consistent use of a single bulb type across the entire 1979-1999 model year range of the GMC C1500 indicates no dome light bulb specification change occurred over that period.