Home › CDL Practice Tests › Combination Vehicles Questions › Question 18
After the electrical cord is plugged in, what should you verify?
- A.That the trailer lights, including brake lights, turn signals, and clearance lights, all work
- B.That the cord hangs below the catwalk
- C.That only the headlights work
- D.That the plug can be pulled out easily while driving
Correct answer
A. That the trailer lights, including brake lights, turn signals, and clearance lights, all work
Why
Other drivers judge your length and intentions by the trailer lights. Testing them after coupling is the only way to know the cord, plug, and trailer circuits are all working together.
Manual topic: Combination Vehicles - Coupling · From the Combination Vehicles practice bank (CV-018).