Possible reasons for turning off all electrical equipment on a car:
1. Battery problems
*Weak battery
*Dead battery
* Battery terminal corrosion
*Poor battery cable connection
2. Problems with the generator
* Faulty generator
* Worn alternator belt
* Voltage regulator problems
3. Problems with electrical wiring
*Damaged or loose wires
* Poor connections
* Electrical system overload
4. Main switch malfunction
*Burnt main switch
* Poor connection at main switch
5. Problems with the car computer
* Faulty ECU (electronic control unit)
* ECU software failures
6. Short circuit
* A short circuit in the electrical system may cause all electrical power to shut down to protect against damage.
Troubleshooting steps:
1. Check the battery: Measure the battery voltage using a voltmeter or multimeter. The battery should produce about 12.6V when off and over 13V when the engine is running.
2. Check the generator: Measure the voltage at the generator output. It should be about 14 V with the engine running and electrical consumers turned on.
3. Check electrical wiring: Visually inspect wires and connectors for damage or looseness.
4. Check the main switch: Reset the main switch and check if the power is restored.
5. Contact a Diagnostician: If you cannot determine the problem yourself, contact a qualified automotive diagnostician for further diagnosis and repair.