Possible reasons:
1. Battery malfunctions:
* Low battery
* Battery terminal corrosion
* Damaged or loose alternator belt
2. Problems with the generator:
* Worn alternator brushes
* Failure of the voltage regulator
* Faulty rotor or stator winding
3. Electrical wiring problems:
* Damaged or corroded electrical wiring
* Loose or damaged connections
*Short circuit or system overload
4. Malfunctions in devices:
* Faulty headlights or warning lights
*Blown fuses
* Faulty radio or other electronic devices
5. Weight problems:
*Loose or damaged ground
*Corrosion of grounding points
* Insufficient contact between the vehicle chassis and the battery ground terminal
Checking and troubleshooting:
1. Check the battery: Measure the battery voltage with a voltmeter. It should be between 12.6-13.2 V when the engine is off and more than 13.5 V when the engine is running. Clean and tighten the battery terminals.
2. Check the generator: Using a voltmeter, check the generator output with the engine running. It should be between 13.8-14.5 V.
3. Troubleshoot electrical wiring: Inspect electrical wiring for damage, corrosion, or loose connections. Repair or replace as needed.
4. Check Appliances: Check for faulty lamps, fuses and electronic devices. Replace or repair them as needed.
5. Check ground: Check the condition of the grounding points, clean and tighten them as necessary. Make sure there is good contact between the vehicle chassis and the battery ground terminal.
If you are unable to locate or repair the problem yourself, seek assistance from a qualified mechanic.