Possible causes of electrical failure on a car:
1. Battery problems:
*Weak or dead battery
*Corrosion or damage to battery terminals
* Faulty generator
2. Electrical wiring problems:
* Damage to wire insulation
* Short circuit or break in wiring
*Blown fuses or relays
3. Malfunction of electronic components:
*Defective starter or starter solenoid
* Faulty ignition switch
* Damaged ECU (electronic control unit)
4. Other reasons:
* Poor ground contact
* Moisture entering electrical components
* Recent installation of new equipment (eg audio system)
Troubleshooting steps:
1. Check the battery:
* Measure the voltage at the battery terminals (must be at least 12.6 V)
* Clean the battery terminals from corrosion
2. Check the electrical wiring:
*Visually inspect wiring harnesses for damage
* Check fuses and replace blown ones
3. Check electronic components:
* Try starting the engine with a different battery (to rule out a battery problem)
*Check the starter for voltage, if there is voltage but the starter does not turn, check the starter solenoid
*Check the ECU for fault codes using a scanner
4. Seek professional help:
*If you are unable to determine the cause of the problem yourself, contact a qualified auto mechanic.
* They can do a more thorough diagnosis and fix the problem.
Attention:
* Be careful when working with vehicle electrical components.
* Do not take any action unless you are sure it is safe.
*Use proper tools and follow all safety precautions.