Chrysler Fifth Avenue Back Up Light Bulb Size

The Chrysler Fifth Avenue back up light requires bulb sizes 1156 and P21W for the specific lighting components. Data for the lighting requirements spans the period from 1983 through 1989.

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
1985-1989	1156
1983	1156

Bulb Specifications

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

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Additional Notes

The 1156 is the sole bulb type specified for the back up light position across all listed model years of the Chrysler Fifth Avenue.
The 1156 bulb follows the ANSI standard, meaning it conforms to a defined North American specification recognized in both the United States and Canada.
It is a single-filament bulb, which means it serves one lighting function only, as opposed to dual-filament bulbs that handle two functions such as braking and running light duties simultaneously.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place rather than screwed in.
The bulb operates at 12 volts and 21 watts, consistent with standard automotive electrical systems of that era.
The Chrysler Fifth Avenue used the 1156 bulb for its back up light across the 1983-1989 model years covered in these specifications.
The BA15s designation indicates a single-contact base with a 15mm collar, which is not interchangeable with the BA15d base used on dual-contact bulbs of otherwise similar physical form.
A 21-watt output at 12 volts places the 1156 in a mid-range category for incandescent automotive bulbs, producing sufficient illumination for reversing visibility without the higher wattage draw of fog or driving lamps.