What Causes the Dashboard Lights to Go Out and the Car to Fail to Start Immediately After Starting?

1 Answers
VanIsabella
07/29/25 1:08pm
The reasons why the dashboard lights go out and the car fails to start immediately after starting include low-voltage system failure and high-voltage system failure. The following are detailed explanations: Common faults in the low-voltage circuit: Insufficient battery charge; poor or incorrect wiring connections; poor battery grounding; damaged distributor or Hall sensor; damaged or poorly connected ignition switch; damaged or poorly connected transistor ignition control unit. The diagnostic method for low-voltage circuit faults mostly involves using an ammeter or voltmeter to check each wire sequentially to eliminate the fault point. Common faults in the high-voltage circuit: Disconnected or leaking high-voltage wires; cracked or punctured distributor cap; burned, corroded, cracked, or punctured distributor rotor; excessive or insufficient spark plug electrode gap; excessive carbon buildup on spark plugs; damaged spark plug insulator; damaged or disconnected ignition coil. Most high-voltage circuit faults are diagnosed using the high-voltage spark test method, which involves removing the central high-voltage wire from the distributor or a cylinder's high-voltage wire, placing the wire end 3-6mm away from the cylinder block, and starting the engine to test for sparks.
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