[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR393.32]

[Page 1062]
 
                        TITLE 49--TRANSPORTATION
 
        CHAPTER III--FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION,
                      DEPARTMENT OF TRANSPORTATION
 
PART 393--PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of Contents
 
    Subpart B--Lighting Devices, Reflectors, and Electrical Equipment
 
Sec. 393.32  Detachable electrical connections.

    Electrical wiring between towing and towed vehicles shall be 
contained in a cable or cables or entirely within another substantially 
constructed protective device. All such electrical wiring shall be 
mechanically and electrically adequate and free of short or open 
circuits. Suitable provision shall be made in every such detachable 
connection to afford reasonable assurance against connection in an 
incorrect manner or accidental disconnection. Detachable connections 
made by twisting together wires from the towed and towing units are 
prohibited. Precaution shall be taken to provide sufficient slack in the 
connecting wire or cable to accommodate without damage all normal 
motions of the parts to which they are attached.