Aston Martin V8 Vantage Turn Signal Bulb Size

Additional Notes

• The front turn signal position on the Aston Martin V8 Vantage uses the 3157NA bulb across the 2006-2017 model years.
• The 3157NA is an ANSI-standardized bulb type, meaning its physical and electrical specifications conform to a recognized North American standard used in the United States and Canada.
• The bulb is a dual-filament type, which means it contains two separate filaments within a single housing, allowing it to serve more than one lighting function at different wattages.
• The 3157NA operates on a 12-volt circuit, consistent with the standard electrical architecture found in passenger vehicles.
• Its two filaments draw 27 watts and 7 watts respectively, with the higher-wattage filament typically associated with the active turn signal flash and the lower-wattage filament used for a parking or running light function.
• The bulb is housed in natural amber glass, which produces the amber-colored output required for turn signal use without relying on a colored lens or coating applied externally.
• The T25 designation refers to the bulb's wedge-base form factor, a common base type in automotive lighting that seats directly into a socket without a separate metal base.
• The "NA" suffix in the 3157NA designation specifically distinguishes this variant from the clear-glass 3157, indicating the amber tint is built into the glass itself rather than added through a separate filter.
• Because the amber coloring is integral to the 3157NA glass, substituting a clear 3157 bulb would alter the output color and may not meet regulatory requirements for turn signal amber coloring in certain jurisdictions.
• The consistent use of the 3157NA across all listed model years indicates that the same socket type and wiring configuration was retained in the front turn signal housing throughout the entire 2006-2017 production span of the V8 Vantage.