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CFR > Title 49 - Transportation > SUBTITLE B—Other Regulations Relating to Transportation > CHAPTER III—FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Parts 300–399) > SUBCHAPTER B—FEDERAL MOTOR CARRIER SAFETY REGULATIONS (Parts 350–399) > PART 393—PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION > SUBPART B—Lamps, Reflective Devices, and Electrical Wiring (§393.9 to §393.31-393.33) > 393.23—Power supply for lamps.
393.23—Power supply for lamps.
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]