Mazda CX-7 Back Up Light Bulb Size

Additional Notes

• The Mazda CX-7 uses the 7440 bulb size for the back up light across all available model years, spanning 2007-2012.
• The 7440 is classified under the ANSI standard, which is the recognized specification system used in the United States and Canada.
• This bulb follows the T20 wedge form factor, a designation that refers to its physical base style, where the base itself acts as the retaining mechanism rather than a separate pin or bayonet fitting.
• The 7440 operates on a 12-volt electrical system, consistent with the standard automotive DC voltage found in passenger vehicles.
• The bulb carries a 21-watt power rating, which places it in the mid-range output category for incandescent automotive lighting.
• The 7440 is a single-filament bulb, meaning it serves one lighting function only, in this case the reverse light, rather than combining multiple functions such as brake and tail into one unit.
• Because the 7440 is single-filament, it is not interchangeable with dual-filament variants in the T20 family, such as the 7443, despite sharing a similar physical appearance and wedge base style.