Home › CDL Practice Tests › General Knowledge Questions › Question 137
Why is the electrical cord checked for firm seating and proper support after coupling?
- A.A loose or dragging cord can cut power to trailer lights and ABS or be torn away during turns
- B.A tight cord steers the trailer
- C.The cord carries air for the trailer brakes
- D.The cord is only for cab comfort items
Correct answer
A. A loose or dragging cord can cut power to trailer lights and ABS or be torn away during turns
Why
Trailer lights, signals, and the ABS all depend on that one cord staying connected and clear of the catwalk and moving parts. Supporting it so it has slack for turns, but cannot sag onto the deck or tires, prevents a dark trailer at night.
Manual topic: Combination Vehicles - Electrical Connections · From the General Knowledge practice bank (GK-137).