Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty truck operating in Northern Ontario frequently experiences cold starts. The technician observes that the glow plug indicator light on the dash is intermittent, and the engine struggles to start below -10°C. Which of the following is the most likely cause?
Intermittent glow plug operation and cold start issues point directly to a problem within the glow plug circuit, such as a faulty relay or timer which controls
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Question: A heavy-duty truck operating in Northern Ontario frequently experiences cold starts. The technician observes that the glow plug indicator light on the dash is intermittent, and the engine struggles to start below -10°C. Which of the following is the most likely cause?
Answer options: ✅ A faulty glow plug relay or timer module.
- A low engine coolant level reading.
- An open circuit in the starter motor solenoid.
- A plugged fuel filter causing restricted fuel flow.
Correct answer: A faulty glow plug relay or timer module.
Explanation: Intermittent glow plug operation and cold start issues point directly to a problem within the glow plug circuit, such as a faulty relay or timer which controls their heating cycle, as per OEM diagnostic procedures for cold-weather starting systems.
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