CDL General Knowledge TestCombination Vehicles (if applicable)Medium
When inspecting the electrical cable connecting the tractor to the trailer, what is an acceptable condition?
- AA cable with frayed insulation but no exposed wires.
- BA cable that is dragging lightly on the ground.
- CA cable with a temporary splice wrapped in electrical tape.
- DA cable that is securely connected and shows no signs of damage or chafing.
Show answer & explanationAnswer & explanation
Correct answer: D. A cable that is securely connected and shows no signs of damage or chafing.
The electrical cable is vital for trailer lights and, in some cases, ABS. It must be in good condition, securely connected, and free from any damage that could compromise its function or pose a short circuit risk.
Why the other options are wrong
- A. Frayed insulation, even without exposed wires, indicates damage and potential for future short circuits or complete failure.
- B. A dragging cable will quickly become damaged, chafed, or pulled apart, leading to electrical failure.
- C. Temporary splices are not acceptable for critical vehicle wiring; they are unreliable and prone to failure.
Electrical Cable Inspection
Checking the condition and connection of the electrical cable between the tractor and trailer to ensure proper operation of trailer lights and electrical systems.
- Must be free of cuts, chafing, or exposed wires.
- Securely connected at both ends.
- Not dragging on the ground.
Memory trick: Lights on, wires tight, everything's right.