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Turn Signal Lights for Semi-Trucks and Commercial Vehicles
DOT-compliant turn signal lights for semi-trucks, trailers, and commercial vehicles. LED and incandescent options are available in round, oval, rectangular, square, triangular, and trapezoid housings to cover a wide range of universal and OE-replacement applications. Amber lens units make up the majority of the selection, with clear lens options also available. A small number of stud-mount fender lights feature amber on one face and red on the other for dual-direction visibility.
Most universal turn signals include a park light function, making them suitable for both front and rear installations. Mounting styles include grommet, surface, stud, and flange mount. Most lights connect via pigtail plug, with a selection of hardwired units also available. OE replacement turn signals are stocked for Peterbilt, Kenworth, Freightliner, and International trucks where specialty housing shapes are required. Most lights are 12V, with a selection of multi-voltage units available. Brands include Automann, Betts, Grote, Pro LED, Truck-Lite, and United Pacific.
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Frequently Asked Turn Signal Questions:
What turn signals are required on a semi-truck and trailer?
Federal regulations under FMVSS 108 and 49 CFR 393 require turn signals at the front and rear of trucks and truck tractors, and at the rear of trailers. Turn signals must be amber or red at the rear and amber at the front, and must flash at a rate of 60 to 120 times per minute. All required lamps must be visible from at least 500 feet.
What is a park light function on a turn signal?
A turn signal with a park light function serves double duty — it operates as a turn signal when the circuit is triggered, and provides steady illumination as a parking or marker lamp when the vehicle lights are on. This makes it suitable for both front and rear installations without needing a separate marker lamp at the same location.
What are stud-mount turn signals used for?
Stud-mount turn signals are designed for fender-mounted applications on the front corners of trucks and tractors. They mount via a threaded stud rather than a grommet or surface bracket. Some stud-mount units in this category are dual-faced, with an amber lens on one side and a red lens on the other, providing visibility from both the front and side of the vehicle.
What is the difference between pigtail and hardwired turn signals?
Pigtail turn signals connect via a molded plug that mates with a corresponding socket in the vehicle's wiring harness, making installation and replacement straightforward without cutting wires. Hardwired units have bare lead wires that are spliced directly into the vehicle's wiring. Hardwired installations are common on older equipment or custom wiring setups where pigtail connectors are not present.
Are OE replacement turn signals available for specific truck makes?
Yes. OE replacement turn signals are available for Peterbilt, Kenworth, Freightliner, and International trucks where the factory housing uses a specialty shape that universal lights will not fit. Check individual product listings for specific make and model compatibility.
Can I replace incandescent turn signals with LED?
In most cases yes, provided the replacement LED lamp is DOT-certified for turn signal use and fits the existing mounting configuration. Note that LED turn signals draw significantly less current than incandescent bulbs, which can cause hyperflashing with a standard thermal flasher. An LED-compatible electronic flasher is required to maintain the correct flash rate — see our Flashers category for compatible units.