Plymouth Gran Fury Back Up Light Bulb Size

Additional Notes

• The Plymouth Gran Fury uses the 1156 bulb size for the back up light across all model years listed in the specifications, spanning 1972-1980 and 1981-1989.
• The 1156 is an ANSI-standardized bulb recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical standards shared across those markets.
• The 1156 bulb operates on a 12-volt electrical system and draws 21 watts, which is consistent with standard automotive reverse lighting applications.
• The 1156 is a single-filament bulb, meaning it serves one lighting function only, as opposed to dual-filament bulbs that can serve two functions such as braking and running light simultaneously.
• The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width, a common automotive socket type.
• Because the Plymouth Gran Fury (1972-1989) uses the same 1156 bulb throughout all listed model years, the back up light socket and bulb specification remained consistent across the entire production span covered by these records.
• The BA15s bayonet base of the 1156 is not interchangeable with dual-contact bayonet bases such as the BA15d, despite the physical similarity in size, as the contact configurations differ.