Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty truck with a 12V electrical system is experiencing slow cranking from the starter motor, but the battery voltage measures 12.6V, and battery load test is good. The resistance check on the main positive battery cable from battery to starter measures 0.5 ohms. What does this resistance value indicate?
For a heavy-duty starter circuit, 0.5 ohms of resistance in the main battery cable is extremely high and would severely impede the high current required to cran
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Question: A heavy-duty truck with a 12V electrical system is experiencing slow cranking from the starter motor, but the battery voltage measures 12.6V, and battery load test is good. The resistance check on the main positive battery cable from battery to starter measures 0.5 ohms. What does this resistance value indicate?
Answer options: ✅ Excessive resistance, severely impeding current flow to the starter
- Normal and acceptable resistance for this type of circuit
- An open circuit, preventing any current flow
- A short circuit, causing excessive current flow
Correct answer: Excessive resistance, severely impeding current flow to the starter
Explanation: For a heavy-duty starter circuit, 0.5 ohms of resistance in the main battery cable is extremely high and would severely impede the high current required to crank the engine, leading to slow cranking. Ideally, resistance in such a cable should be very close to zero (typically less than 0.05 ohms).
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