Chevrolet Silverado Parking Light Bulb Size

Additional Notes

• The 7443 bulb is the most frequently specified front parking light across the Chevrolet Silverado range covered in these specifications, appearing across multiple model years and trim configurations from 2014 through 2024.
• The 7443 is a dual-filament T20 wedge bulb rated at 12V with a 21W high filament and 5W low filament, conforming to the ANSI standard used in the United States and Canada.
• The 7444NA shares the same T20 wedge form factor, voltage, and wattage ratings as the 7443 but features natural amber glass rather than a clear envelope, which produces the amber color required for parking light compliance without a separate lens filter.
• The 4157NA and 3157NA are both dual-filament T25 wedge bulbs rated at 12V, 27W/7W with natural amber glass. The 5702AK carries the same electrical ratings and T25 form factor but uses an amber coating rather than natural amber glass, as it is a Sylvania-specific part number for a coated variant of the ANSI 3157 bulb.
• Because the 7443 and 7444NA share identical physical and electrical specifications, the only functional difference between them is the amber coloring of the 7444NA envelope. Substituting a clear 7443 where a 7444NA is specified may affect the amber output of the parking light if the housing lens does not itself provide amber coloring.
• The Chevrolet Silverado 1500 and the 2500/3500 HD variants are specified with different bulb sizes in several overlapping model years, meaning the two configurations are not interchangeable without confirming the specific truck variant.
• For the 2018-2023 Silverado 1500, the presence or absence of HID headlamps is a documented fitment condition. In 2016-2018, the 1500 with HID headlamps takes a 7443, while non-HID 1500 trims in those years take a 7444NA, making headlamp type a required consideration before selecting a replacement bulb.
• The 2023 Silverado 1500 is specified with two distinct bulb sizes: the 194 and the 7443. The 194 is a miniature T10 wedge bulb rated at only 3.78W, which is electrically and physically incompatible with the 7443, indicating these two entries correspond to different lighting positions or package configurations within the same model year.
• The 3157NA was the specified front parking light bulb for the Chevrolet Silverado from 1999 through 2006, representing the longest continuous use of a single bulb type across the years covered in these specifications.
• All bulb types listed in these specifications conform to ANSI standards applicable in the United States and Canada, with the exception of the 5702AK, which is identified as a Sylvania part number rather than a standalone ANSI designation.