Peterbilt 330 Back Up Light Bulb Size

Additional Notes

• The Peterbilt 330 uses the 1156 bulb for its back up light across all model years listed in the specifications, from 1995 through 2017.
• The 1156 is an ANSI-standardized bulb type recognized across the United States and Canada, making it a widely available replacement in the North American market.
• The 1156 bulb operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent automotive signal and reverse lighting applications.
• The 1156 uses a BA15s bayonet base, which is a single-contact bayonet mount. The "s" in BA15s denotes a single center contact at the base, as opposed to the dual-contact BA15d found on two-filament bulbs such as the 1157.
• Because the 1156 is a single-filament bulb, it is not interchangeable with dual-filament bayonet-base bulbs of the same physical size, such as the 1157, without electrical and socket compatibility considerations.
• The 1997 Peterbilt 330 has two separate back up light bulb entries: one for vehicles with Halogen Capsule Headlamps and one without that designation, both specifying the 1156. This indicates a trim or configuration distinction existed for that model year.
• The 1996 Peterbilt 330 similarly carries two entries, one for vehicles with 4 Rectangular Headlamps and one without that designation, both calling for the 1156 bulb.
• The 1995 Peterbilt 330 also has two entries, one for vehicles with 4 Round Headlamps and one without, with both specifying the 1156 bulb for the back up light position.