Chevrolet G-Van Courtesy Bulb Size

Additional Notes

• The Chevrolet G-Van courtesy bulb specifications span model years 1978 through 1995, with four distinct bulb types used across that range: the 212-2, 906, 194, and 1004.
• The 212-2 is the most frequently specified courtesy bulb across the G-Van lineup, appearing in the 1978, 1985-1988, 1991-1992, and 1995 model years.
• The 212-2 is a festoon-type bulb with an SV8.5 base and a 41mm length, operating at 12V and 12W. Its festoon form factor means it is held in place by spring-loaded end caps rather than a socket base.
• The 906 is the second most common bulb type in these specifications, covering the 1989-1990 and 1993-1994 model years. It is a T10 miniature wedge bulb rated at 12V and 8W.
• Although both the 906 and 194 share the T10 miniature wedge form factor, they are not interchangeable. The 194 draws only 3.78W compared to the 906's 8W, reflecting a meaningful difference in light output.
• The 194 bulb is specified only for the 1980 G-Van. Its lower wattage relative to the 906 places it among the least powerful bulbs in this specification set.
• The 1004 bulb, specified for the 1979 G-Van, is a dual-filament bulb with a BAY15d bayonet base. It is noted as a variant of the 1157 and carries a 21/5W rating, meaning its two filaments serve different power levels.
• The presence of a dual-filament bulb in the 1979 courtesy position is a notable distinction, as all other model years in these specifications use single-filament or festoon bulbs for that application.
• All four bulb types listed carry ANSI standard designations valid in both the United States and Canada, indicating compliance with a shared North American standardization framework.
• The alternating pattern between 212-2 and 906 bulbs across several consecutive model year groups indicates that the two bulb types are not interchangeable, as their base types differ: the 212-2 uses an SV8.5 festoon base while the 906 uses a wedge base.