Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During a pre-shift inspection of a road grader, the operator reports that the 'Wait-to-Start' indicator light for the glow plugs does not illuminate, even in cold conditions, but the engine eventually starts. Diagnostic software shows no fault codes for the glow plug circuit. What should the technician investigate FIRST?
If the engine still starts, it suggests the glow plugs themselves might be working, but the indicator light is not. The first and simplest check would be for a
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Question: During a pre-shift inspection of a road grader, the operator reports that the 'Wait-to-Start' indicator light for the glow plugs does not illuminate, even in cold conditions, but the engine eventually starts. Diagnostic software shows no fault codes for the glow plug circuit. What should the technician investigate FIRST?
Answer options: ✅ Blown fuse for the glow plug indicator light circuit.
- Faulty glow plug relay (controller).
- Open circuit in all individual glow plugs.
- A short to ground in the glow plug power supply wire.
Correct answer: Blown fuse for the glow plug indicator light circuit.
Explanation: If the engine still starts, it suggests the glow plugs themselves might be working, but the indicator light is not. The first and simplest check would be for a blown fuse in the indicator light's circuit, as this directly affects the light's operation without necessarily impacting the glow plug function itself.
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