Cadillac Escalade Turn Signal Bulb Size

Additional Notes

• The "NA" suffix present on all front turn signal bulbs in the Cadillac Escalade specifications denotes natural amber glass, which produces an amber color output from the bulb itself rather than relying on a colored lens or housing to filter a clear light source.
• The T25 wedge base is the most frequently specified base type across the Escalade's front turn signal history, appearing in the 3357NA, 3457NA, 3757NA, 3157NA, 3157, and 3057 bulb types.
• The 7440NA is a single-filament T20 wedge bulb rated at 12V and 21W, and it serves as the front turn signal bulb for the Cadillac Escalade across the 2015-2020 model years.
• The 3457NA and 3157NA are both dual-filament T25 wedge bulbs rated at 12V with a 27W/7W output, making them functionally similar despite carrying different ANSI part numbers. The Escalade's front turn signal specifications use 3457NA for 2009-2013 (excluding 2012) and 3157NA for 2002-2006.
• A dual-filament bulb contains two separate filaments within a single envelope, allowing it to serve two distinct lighting functions, such as a turn signal and a parking light, from one socket.
• The 2357NA, specified for the 1999-2000 Escalade front turn signal, differs from the other front turn signal bulbs in that it uses a BAY15d bayonet base rather than a wedge base. The BAY15d base features two pins offset at different heights to ensure correct orientation during installation.
• The 3357NA is a single-filament T25 wedge bulb rated at 12V and 27W, and it is specified for the 2012 and 2014 Escalade front turn signal. Its single-filament construction contrasts with the dual-filament 3457NA used in adjacent model years.
• The rear turn signal specifications for the Cadillac Escalade cover only the 1999-2006 model years. The 3157 is specified for 2002-2006, while the 3057 is specified for 1999-2000. Both are dual-filament T25 wedge bulbs rated at 12V and 27W/7W, and neither carries the NA suffix, indicating clear rather than natural amber glass.
• The 3157 and 3057 share identical voltage and wattage ratings of 12V and 27W/7W, yet they carry distinct ANSI part numbers. Despite their similar electrical characteristics, they are not confirmed as interchangeable within these specifications, and substituting one for the other without verifying socket compatibility could result in an improper fit.
• All bulbs listed across both front and rear turn signal positions conform to ANSI standards applicable in the United States and Canada, as indicated by the ANSI standard notation in each bulb description.