LIGHT BULBS

Light Bulbs For Peterbilt Trucks

Keeping all lighting on a commercial truck operational isn't just a maintenance matter -- burned-out marker lights, brake lights, or clearance lights are citable violations during roadside inspections. We carry replacement light bulbs in the common sizes and base types used across Peterbilt truck lighting systems, from sealed beam headlight units to small incandescent marker and indicator bulbs. Keep a supply of frequently needed bulbs on hand to address failures quickly and stay inspection-ready.

Frequently asked questions about light bulbs

What are the most commonly replaced light bulbs on a Peterbilt?

Marker and clearance lights see the highest replacement frequency on most trucks -- they're small, run continuously, and take constant vibration. Stop/tail/turn bulbs are also frequent replacement items, particularly on trailers where connections and grounds degrade over time. Interior cab bulbs, dashboard indicator lights, and courtesy lights are less frequent but worth keeping on hand for owner-operators who want to handle minor issues without a shop visit. Sealed beam headlights have largely been replaced by bulb-style or LED assemblies, but replacement sealed beams are still needed on older configurations.

How do I find the right replacement bulb for my Peterbilt?

The most reliable approach is to remove the burned-out bulb and look for the number printed on the base or glass envelope -- most automotive and truck bulbs use standardized numbers like 1157, 194, or 921 that cross-reference across manufacturers. The lighting fixture itself may also have the bulb number printed on the housing. If you can't find a number, measuring the base size and noting whether the bulb is single-filament or dual-filament helps narrow the selection quickly.

Should I upgrade to LED bulbs on my Peterbilt?

For most applications, yes. LED replacements in common truck bulb sizes are widely available and offer significantly longer service life, lower current draw, and faster illumination response than incandescent bulbs. The faster response time on brake lights gives following drivers a fraction of a second more reaction time -- a meaningful safety benefit at highway speeds. The main consideration is verifying DOT compliance for the specific application and ensuring the LED replacement is compatible with the existing socket and any flasher modules that may need to be changed to handle LED current draw.

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