Plymouth Acclaim Back Up Light Bulb Size

Additional Notes

• The Plymouth Acclaim back up light specifications cover model years 1989 through 1995 and reference three distinct bulb sizes: 921, 3157, and 3057.
• The 921 is a single-filament wedge bulb of the T15 form factor, rated at 12V and 16W, and follows the ANSI standard applicable in both the US and Canada.
• The 3157 and 3057 are both dual-filament wedge bulbs of the T25 form factor, each rated at 12V with a 27W/7W output, and both conform to the same ANSI standard.
• A dual-filament bulb carries two separate filaments within a single envelope, allowing it to serve two lighting functions at different wattages from one socket.
• The 921 bulb is specified for the Plymouth Acclaim across the 1992, 1994, and 1995 model years.
• The 3057 bulb is specified for the 1989-1991 model years, making it the bulb associated with the earliest production period covered in these specifications.
• The 1993 model year is the sole year specifying the 3157 bulb, which shares its voltage and wattage ratings with the 3057 but differs in its pin and socket configuration, making the two types non-interchangeable despite their identical power ratings.
• The T15 and T25 designations refer to the tubular bulb envelope size, with T25 being physically larger than T15, meaning the 921 and the dual-filament types occupy different socket sizes and are not interchangeable with one another.