Freightliner FL112 Parking Light Bulb Size

Additional Notes

• The Freightliner FL112 uses the 1157 bulb for its parking light across all listed model years, spanning 1996-2003.
• The 1157 is an ANSI-standardized bulb type recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared by all compliant manufacturers.
• The 1157 operates on a dual-filament design, which allows a single bulb to serve two distinct brightness levels within one housing, a common arrangement in combined stop and parking light applications.
• The bulb uses a BAY15d bayonet base, a two-pin offset base type where the two pins are positioned at different heights to ensure the bulb can only be seated in one rotational orientation, preventing incorrect filament alignment.
• The 1157 is rated at 12 volts, consistent with standard 12V automotive electrical systems.
• The two filaments are rated at 21 watts and 5 watts respectively, with the higher-wattage filament typically associated with the stop or turn signal function and the lower-wattage filament associated with the parking or running light function.
• Because the 1157 is a dual-filament bulb, single-filament substitutes such as the 1156 are not interchangeable, as the 1156 shares the same BAY15s base style but carries only one filament and uses a single-pin offset configuration.