Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A diagnostic trouble code (DTC) indicates a persistent 'low voltage' issue for an electrical circuit. After checking the battery and alternator, where should the technician focus their diagnostic efforts next?
Low voltage in an electrical circuit, despite good power source, often points to excessive resistance. This resistance can be caused by corrosion, loose connect
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Question: A diagnostic trouble code (DTC) indicates a persistent 'low voltage' issue for an electrical circuit. After checking the battery and alternator, where should the technician focus their diagnostic efforts next?
Answer options: ✅ Checking for high resistance in the circuit wiring or connectors
- Replacing the component that the circuit powers
- Inspecting the exhaust system for leaks
- Checking the engine oil level
Correct answer: Checking for high resistance in the circuit wiring or connectors
Explanation: Low voltage in an electrical circuit, despite good power source, often points to excessive resistance. This resistance can be caused by corrosion, loose connections, or damaged wiring, impeding current flow and dropping voltage.
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