Which electrical component fault can completely interrupt power supply to the ignition and starter circuits, causing engine not starting?
Main fuse blown off
To determine which electrical component fault can completely interrupt power supply to the ignition and starter circuits, causing the engine not to start, let's examine each option:
- Main fuse blown off: The main fuse is critical in protecting the vehicle's electrical circuits. If it is blown, the entire power supply to the ignition and starter circuits is interrupted, preventing the engine from starting. This aligns directly with the issue described in the question, making this the correct choice.
- Defective brushes in starter: Brushes in the starter motor are essential for maintaining electrical contact as the motor revolves. While defective brushes can affect the starter motor's performance, they do not completely interrupt the power supply to the ignition circuit. Hence, this option can cause starting issues but not a complete interruption of the circuit.
- Air lock in fuel system: An air lock affects the fuel delivery system and prevents the flow of fuel to the engine, potentially causing starting issues. However, it does not affect the electrical power supply to the ignition and starter circuits.
- Defective starting relay: A starter relay controls the power to the starter motor. A defective relay can prevent the engine from starting, but it does not interrupt power to the ignition circuit entirely.
Based on the analysis above, the only option that can completely interrupt the power supply to both the ignition and starter circuits is the Main fuse blown off.
Thus, the correct answer is Main fuse blown off.
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