Possible causes of electrical failure in a car:
Battery problems:
*Dead or completely dead battery
* Faulty battery terminals
* Problems connecting wires to the battery
Generator problems:
* Faulty generator
* Bad alternator drive belt
*Blown generator fuse
Wiring problems:
*Blown fuses or relays
* Faulty switches or switches
* Wire breaks or short circuit
* Poor contact in connectors
Problems with the vehicle computer (ECU):
*Faulty ECU
*Damaged ECU wiring harnesses
* ECU power problems
Other possible reasons:
* Faulty ignition switch
* Faulty main relay unit
* Problems with the ignition switch
* Faulty control modules (eg engine control module)
Troubleshooting steps:
1. Check the battery: Make sure it is clean, the terminals are tight, and the battery has sufficient charge.
2. Check the generator: Start the engine and measure the voltage at the battery. It should be between 13.5 and 14.5 volts with the engine running.
3. Check fuses and relays: Inspect the fuse and relay panel for burnt or damaged components.
4. Check Wiring: Inspect the main wiring for damage or breaks. Check the connectors for good connections.
5. Check the vehicle’s computer (ECU): If other components are working normally, the problem may be in the ECU. Have the ECU diagnosed by a qualified mechanic.