Mercury Mystique Back Up Light Bulb Size

The Mercury Mystique back up light utilizes 1156 and P21W bulb sizes according to the provided technical specifications for the lighting components. Data for the specific bulbs covers the range from 1995 through 2000.

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
1995-2000	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 Mercury Mystique uses the 1156 bulb for the back up light across all listed model years, spanning 1995-2000.
The 1156 is an ANSI-standardized bulb type, meaning its 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 is a single-filament bulb, meaning it serves one lighting function only, as opposed to dual-filament types that handle two functions such as braking and running light simultaneously.
The BA15s bayonet base on the 1156 features a single locating pin on the base collar, which distinguishes it from the BA15d type that carries two offset pins. Substituting a dual-pin bulb in a single-pin socket is not possible without modification.