Lighting For Peterbilt Trucks

Proper lighting on a Class 8 Peterbilt is both a federal safety requirement and a practical necessity for drivers covering thousands of miles across all conditions. FMCSA mandates specific lighting configurations for commercial motor vehicles — headlights, clearance lights, marker lights, tail lights, brake lights, and turn signals must all function correctly to pass inspection and operate legally. We carry a comprehensive selection of exterior lighting for Peterbilt trucks, from LED clearance and marker lights to work lights, fog lights, and complete lighting kits.

Frequently asked questions about lighting

What lighting is required by FMCSA on a Class 8 Peterbilt?

FMCSA regulations require headlights, tail lights, brake lights, turn signals, hazard lights, clearance lights, identification lights (three amber on front, three red on rear), side marker lights, and reflectors at specified locations on the vehicle. The exact requirements vary slightly by vehicle width and length — vehicles over 80 inches wide have additional clearance and identification light requirements. A DOT lighting compliance guide for your specific configuration is the authoritative reference before a vehicle inspection.

Should I upgrade my Peterbilt's marker and clearance lights to LED?

LED marker and clearance lights are one of the most cost-effective upgrades available for a Peterbilt. They draw a fraction of the current of incandescent bulbs, produce brighter, more visible output, and last significantly longer — reducing the frequency of roadside violations from burned-out marker lights during long hauls. Most LED marker lights are direct plug-and-play replacements that drop into the original housing without wiring changes, making the upgrade a straightforward shop task.

How do I find a lighting short that keeps blowing fuses on a Peterbilt?

Isolate the circuit using the fuse panel diagram and disconnect lighting loads one at a time while monitoring current draw — the load that causes the fuse to blow or the current to spike is the source of the short. A test light or circuit breaker substituted for the fuse allows you to keep the circuit energized while probing for the fault. Chafed wiring where harnesses run through grommets or along the frame rail, corroded socket grounds, and water intrusion into light housings are the most common sources of lighting shorts on high-mileage trucks.

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