Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A technician is diagnosing a parasitic draw on a 12V heavy equipment battery. After fully charging the battery, a digital multimeter is connected in series between the negative battery terminal and the negative battery cable. The multimeter reads 1.5 Amperes. According to most battery manufacturers, what is the maximum acceptable parasitic draw for a 12V system?
A healthy 12V automotive or heavy equipment system should have a parasitic draw of no more than 25-50 mA (0.025-0.050 Amperes) to prevent battery discharge over
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Question: A technician is diagnosing a parasitic draw on a 12V heavy equipment battery. After fully charging the battery, a digital multimeter is connected in series between the negative battery terminal and the negative battery cable. The multimeter reads 1.5 Amperes. According to most battery manufacturers, what is the maximum acceptable parasitic draw for a 12V system?
Answer options: ✅ 25-50 milliamperes (mA)
- 1.0-2.0 amperes (A)
- 500-750 milliamperes (mA)
- 5-10 amperes (A)
Correct answer: 25-50 milliamperes (mA)
Explanation: A healthy 12V automotive or heavy equipment system should have a parasitic draw of no more than 25-50 mA (0.025-0.050 Amperes) to prevent battery discharge over typical periods of inactivity. 1.5 Amperes is significantly high and indicates a fault.
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