§393.23 Power supply for lamps. RegSenseFleet SafetyFederal Motor Carrier Safety Administration (FMCSA), DOTCFR RegulationsCMV Parts and MaintenanceCMV lights, reflectors, and reflective tapeParts and Accessories - Motor CarrierFocus AreaCFR SectionEnglishTransportationUSA
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]['CMV Parts and Maintenance']['CMV lights, reflectors, and reflective tape', 'Parts and Accessories - Motor Carrier']