Prevost High Decker Back Up Light Bulb Size

The Prevost High Decker back up light requires a bulb size of 1156 for the rear lighting system. Data for the specified component covers the range from 2000 to 2003.

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
2000-2003	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Prevost High Decker uses the 1156 bulb for the back up light across the 2000-2003 model years.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard shared across the United States and Canada.
The 1156 operates on a 12-volt electrical system, which is consistent with standard automotive DC voltage.
At 21 watts, the 1156 produces a moderate output level typical of incandescent reverse lighting applications.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width. The "s" in BA15s indicates a single contact point at the base, which is a key fitment detail.
Because the 1156 is a single-filament bulb, it serves only one lighting function per socket, unlike dual-filament variants such as the 1157, which handles two functions from a single housing.
The BA15s base of the 1156 is not interchangeable with the BA15d base found on dual-contact bulbs. Substituting a dual-contact bulb in a single-contact socket would result in incorrect fitment.
The 1156 and 1157 share the same BA15 base width but differ in contact configuration, making them physically similar yet electrically incompatible as direct replacements for one another.