Peterbilt 357 Dome Light Bulb Size

Additional Notes

• The Peterbilt 357 uses the bulb size 97 for the dome light across all specified model years, spanning 1986-1997, under the condition of having 2 rectangular headlamps.
• The 97 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, meaning it serves one lighting function rather than switching between two brightness levels as a dual-filament bulb would.
• The 97 bulb uses a BA15s bayonet base, which is a single-contact bayonet mount with a 15mm collar, designed to lock into place with a push-and-twist motion.
• Operating at 12 volts and 13 watts, the 97 bulb is suited to standard 12V automotive electrical systems.
• The 97 is noted as a variant of the 1156 bulb. While the two share a BA15s base and single-filament design, they are not identical, and substitution between them warrants attention to exact voltage and wattage ratings before use.
• The headlamp configuration noted in the fitment condition, specifically 2 rectangular headlamps, is a structural qualifier tied to each model year entry in the specifications, indicating that this dome light fitment applies to that particular headlamp arrangement on the Peterbilt 357.