CDL Combination Vehicles TestCoupling and UncouplingMedium
After coupling, a driver notices that the trailer's electrical cable is dangling and touching the catwalk. What is the most immediate concern with this condition?
- AIt will drain the tractor's battery faster.
- BIt suggests the cable is too long for the combination.
- CIt risks chafing and damage to the cable, leading to light or ABS failure.
- DIt can cause the electrical system to short circuit.
Show answer & explanationAnswer & explanation
Correct answer: C. It risks chafing and damage to the cable, leading to light or ABS failure.
An electrical cable that is dangling and touching the catwalk is at high risk of chafing and abrasion as the vehicle moves and turns. This can quickly wear through the insulation, leading to exposed wires, short circuits, or complete failure of trailer lights and the Anti-lock Braking System (ABS).
Why the other options are wrong
- A. A dangling cable itself doesn't inherently drain the battery faster unless a short circuit occurs, which is a consequence of the chafing.
- B. The length might be appropriate but improper securing causes it to dangle.
- D. While possible, chafing leading to damage is a more immediate and common risk than an instant short circuit from just touching the catwalk.
Electrical Cable Securing
The practice of properly routing and securing the trailer's electrical cable to prevent chafing, damage, and ensure continuous electrical function.
- Prevents cable damage.
- Ensures reliable lights and ABS.
- Part of pre-trip and coupling checks.
Memory trick: Secure the wire, prevent the fire (or failure).