Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A Canadian oil sands mining truck, operating a 24V starting system, needs new starter motor cables. The original cables are 2/0 AWG. The technician decides to replace them with 4/0 AWG cables, which have a larger copper cross-sectional area. What is the primary benefit of using the larger 4/0 AWG cables in this 24V system?
Using larger gauge cables (smaller AWG number like 4/0 compared to 2/0) reduces the electrical resistance of the cable. Lower resistance minimizes voltage drop
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Question: A Canadian oil sands mining truck, operating a 24V starting system, needs new starter motor cables. The original cables are 2/0 AWG. The technician decides to replace them with 4/0 AWG cables, which have a larger copper cross-sectional area. What is the primary benefit of using the larger 4/0 AWG cables in this 24V system?
Answer options: ✅ Reduced voltage drop, improving starter motor performance.
- Increased total system voltage to assist in cold weather starts.
- Higher cranking amperage delivered to the starter motor at the battery terminal.
- Improved fuel efficiency due to less power loss in the electrical system.
Correct answer: Reduced voltage drop, improving starter motor performance.
Explanation: Using larger gauge cables (smaller AWG number like 4/0 compared to 2/0) reduces the electrical resistance of the cable. Lower resistance minimizes voltage drop between the battery and the starter motor, ensuring more of the battery's voltage is available, which significantly improves starter motor performance, especially in demanding 24V applications.
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