Home › CDL Practice Tests › General Knowledge Questions › Question 122
The battery or charging warning light stays on while the engine is running. What does that most likely mean?
- A.The oil needs changing
- B.The battery is fully charged and resting
- C.The charging system is not keeping up, and the truck is running on battery power that will soon run out
- D.The headlights are simply set too bright
Correct answer
C. The charging system is not keeping up, and the truck is running on battery power that will soon run out
Why
The warning means the alternator is not delivering normal charge, often because of a loose or broken belt or a failed unit. Electrical loads will drain the batteries, and the truck can stall once voltage falls too low.
Manual topic: Vehicle Systems - Electrical · From the General Knowledge practice bank (GK-122).