Freightliner 114SD Parking Light Bulb Size

Additional Notes

• The 3157NA is the specified parking light bulb for the Freightliner 114SD across all listed model years, 2012-2018.
• The 3157NA is an ANSI-standardized bulb type, meaning its physical and electrical specifications conform to a defined North American standard recognized in both the United States and Canada.
• The bulb follows a T25 wedge form factor, which refers to a tapering plastic base that seats directly into a socket without a separate metal base or locking pins.
• It carries a dual-filament design, operating at 27 watts on the high-intensity filament and 7 watts on the low-intensity filament, allowing a single bulb to serve two distinct lighting functions within one housing.
• The natural amber glass of the 3157NA produces a yellow-tinted output directly from the envelope itself, rather than relying on a colored lens or coating applied externally.
• The bulb operates on a 12-volt electrical system, consistent with standard automotive and commercial vehicle DC power architecture.
• The "NA" suffix in the designation distinguishes this bulb from the clear-glass 3157, and substituting a 3157 in place of a 3157NA would alter the output color since the amber tint is integral to the glass envelope rather than the fixture.