Peterbilt 282 Back Up Light Bulb Size

The Peterbilt 282 back up light utilizes bulb size P21W and bulb size 199 for illumination. Data for the specified components covers the range from 1974 to 1980.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1980	P21W
1979	199
1974-1978	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	199

Other Locations

Additional Notes

The P21W bulb is the back up light specification for the Peterbilt 282 across the 1974-1978 and 1980 model years.
The P21W follows the ECE standard, which governs automotive lighting regulations in Europe and internationally, as opposed to the ANSI standard used in North America.
Both the P21W and the 199 bulb operate at 12 volts and consume 21 watts, placing them in the same electrical performance category.
Both bulbs use a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin offset to one side of the base.
Each bulb type in these specifications is single-filament, meaning it serves one lighting function rather than combining two functions such as stop and tail in a single unit.
The 1979 Peterbilt 282 uses the 199 bulb, which follows the ANSI standard applicable to the United States and Canada.
The 199 is classified as a variant of the 1156 bulb, a widely used North American automotive bulb, though the two are not necessarily interchangeable without confirming base and electrical compatibility.
Despite the P21W and 199 sharing the BA15s base type and identical wattage, their differing regulatory standards mean one should not be assumed as a direct substitute for the other without verification.