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§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']['Parts and Accessories - Motor Carrier', 'CMV lights, reflectors, and reflective tape']