Chevrolet Beretta Trunk Bulb Size

Additional Notes

• The Chevrolet Beretta trunk bulb specifications span the full production run of the model, covering 1987 through 1994, with three distinct bulb types used across those years: the 906, 912, and 917.
• The 917 bulb is a T15 wedge type rated at 12V and 18W under the ANSI standard applicable in both the United States and Canada. It was fitted to the Beretta from 1990 through 1993, making it the most frequently specified trunk bulb across the model's production years.
• The 912 bulb is also a T15 wedge type and shares the same ANSI regional scope as the 917, but operates at a lower wattage of 12W at 12V. It is noted as a variant of the 921 bulb, which indicates a close physical and electrical relationship between the two, though they are not identical replacements for one another.
• The 906 bulb is a T10 miniature wedge type rated at 12V and 8W. It was specified exclusively for the 1994 model year, representing a departure from the T15 form factor used in all prior years.
• Because the 1994 Beretta uses a T10 906 bulb while all preceding years use T15 bulbs, the two form factors are not interchangeable. The T10 and T15 designations refer to different base widths in the wedge bulb family, which determines physical fitment in the socket.
• The 912 and 917 are both T15 wedge bulbs, but their wattage ratings differ at 12W and 18W respectively. Despite sharing the same base type, substituting one for the other would result in a mismatch in light output and electrical load.