Possible reasons why the car starts, but the electrics do not work:
Battery problems:
*Low battery
* Low battery
*Corrosion or damage to battery terminals
Generator problems:
* Faulty generator
* Faulty generator voltage regulator
* Broken alternator belt
Wiring problems:
*Blown fuses
* Broken or damaged wires
* Poor electrical connections
*Corrosion or damage to connectors
Problems with the ECU (electronic control unit):
* Faulty ECU
* Lost connection with other electrical components
* Errors in ECU firmware
Problems with other electrical components:
* Faulty starter
* Faulty starter relay
* Faulty ignition switch
* Faulty light switch
* Faulty power window switch
Diagnostics and troubleshooting:
1. Check battery voltage: Check the voltage at the battery terminals using a voltmeter. The voltage should be about 12.6 volts with the engine off and about 14 volts with the engine running.
2. Inspect Wires and Connections: Check for broken, damaged or corroded wires. Inspect all connectors and make sure they are securely connected.
3. Check fuses: Locate the fuse box and check all fuses for continuity. Replace any blown fuses with new ones.
4. Check the generator: Examine the condition of the generator belt for wear or breakage. Check the voltage at the generator terminals with a voltmeter. If the voltage is not normal, then the generator may be faulty.
5. Consult a Professional: If you cannot determine or fix the problem yourself, contact a qualified mechanic or electrician.