Chevrolet Beretta Parking Light Bulb Size

Additional Notes

• The 2057 bulb is a dual-filament type with a BAY15d bayonet base, rated at 12V with a high filament draw of 26.9W and a low filament draw of 8W. It is designated as a brighter variant of the 1157 bulb.
• The 2057NA shares the same electrical ratings, base type, and dual-filament construction as the 2057, differing only in its natural amber glass envelope, which produces an amber output without a separate lens or coating.
• The Chevrolet Beretta used the 2057 bulb for parking lights across the 1987-1989 model years, then transitioned to the 2057NA for the 1991-1994 model years.
• The 2057 and 2057NA are electrically and physically interchangeable due to their identical BAY15d base and matching voltage and wattage ratings. However, substituting a 2057 for a 2057NA would result in a clear rather than amber light output.
• The 1990 Chevrolet Beretta uses a substantially different bulb for the parking light position. The 194NA is a miniature wedge-base T10 bulb rated at 12V and 3.78W, a single-filament type with no bayonet base, making it physically and electrically incompatible with the 2057-series bulbs used in surrounding model years.
• The low wattage of the 194NA at 3.78W contrasts sharply with the 8W low-filament rating of the 2057NA, reflecting a significant difference in light output between the 1990 fitment and those of adjacent years.
• All three bulb types listed carry ANSI standard designation applicable to both the United States and Canada, indicating conformance to a shared North American specification.
• The BAY15d base used by both the 2057 and 2057NA is an offset dual-contact bayonet fitting, a design that prevents incorrect single-filament bulbs from being seated in a dual-filament socket.