General malfunctions of the car electrical system:
Battery
* Discharged or dead battery
* Faulty terminals or corrosion
* Faulty generator
Ignition system
* Faulty spark plugs or ignition coils
* Faulty ignition distributor
*Faulty Engine Control Module (ECM)
Lighting system
* Burnt out light bulbs
* Faulty cartridges
* Faulty fuses
*Wiring problems
Charging system
* Faulty generator
* Faulty voltage regulator
* Defective battery
* Faulty wiring
Electrical comfort systems
* Faulty window regulators
* Faulty radio or audio system
* Faulty wipers
* Faulty door locks
* Problems with climate control
Sensors and electronic systems
* Faulty sensors (eg speed sensor, air flow sensor)
* Faulty electronic control units (eg ECM, transmission control module)
* Electromagnetic compatibility issues
* Faulty wiring
Signs of a faulty car electrical system:
* Difficulty or inability to start the engine
* Dim or flickering headlights
* Radio or audio system malfunctions
* Faulty electrical comfort systems (eg power windows, door locks)
*Warning messages on the dashboard
* Unstable engine operation or transmission problems
*Battery drains too quickly
* Unusual noises or odors from electrical systems
Troubleshooting precautions:
* Always disconnect the battery before working on the electrical system.
* Use correct tools and dielectric gloves.
* Be careful with exposed wires and terminals.
* Check fuses and relays before further diagnosis.
*Refer to your specific vehicle’s repair manual for more information.