C.F.R. » Title 49 » CHAPTER III—FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER B—FEDERAL MOTOR CARRIER SAFETY REGULATIONS › PART 393—PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION › Subpart B—Lamps, Reflective Devices, and Electrical Wiring

49 C.F.R. § 393.23

Power supply for lamps

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All required lamps must be powered by the electrical system of the motor vehicle with the exception of battery powered lamps used on projecting loads.

[70 FR 48046, Aug. 15, 2005]