Freightliner FL106 front turn signal bulbs measure 1156 in size, while rear turn signal bulbs measure 1157 in size. The replacement chart covers vehicle production spanning 1994 to 2003.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Freightliner FL106 uses the 1156 bulb for the front turn signal across all listed model years, spanning 1994-2003.
The 1156 is a single-filament bulb operating at 12V and 21W, fitted with a BA15s bayonet base, and recognized under ANSI standards in both the United States and Canada.
The rear turn signal on the Freightliner FL106 uses the 1157 bulb across the same 1994-2003 model year range.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with two wattage outputs of 21W and 5W, corresponding to its turn signal and parking light filaments respectively.
Although the 1156 and 1157 share a similar physical profile and both use bayonet-style bases, their base configurations differ. The BA15s base of the 1156 has a single contact pin, while the BAY15d base of the 1157 has two offset contact pins, making the two bulbs non-interchangeable.
The dual-filament design of the 1157 allows a single rear housing to serve more than one lighting function, which is a common arrangement in rear signal assemblies where turn and parking functions are combined.