Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During a charging system test, the technician measures the output voltage at 12.8 V with the engine running and accessories off. The battery is known to be fully charged. What does this reading indicate?
A healthy charging system should produce a voltage between 13.5 V and 14.5 V when the engine is running and the battery is fully charged. 12.8 V indicates the a
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Question: During a charging system test, the technician measures the output voltage at 12.8 V with the engine running and accessories off. The battery is known to be fully charged. What does this reading indicate?
Answer options:
- The alternator is overcharging the battery.
- The voltage regulator is functioning correctly. ✅ The alternator is not producing sufficient voltage.
- There is a short circuit in the charging system.
Correct answer: The alternator is not producing sufficient voltage.
Explanation: A healthy charging system should produce a voltage between 13.5 V and 14.5 V when the engine is running and the battery is fully charged. 12.8 V indicates the alternator is not producing sufficient voltage to properly charge the battery.
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