plz need ur helps guys , in the morning i went to open the car and i noticed the security system working and central lock not working , i opened the car by keys and i try to open contact and security system gave alarm and no connection to start the car i checked all wires for security system and all seems normal , i checked the fuse for central lock and was normal too , and i close car and i went to work and when i came back i tried again i noticed no any electrics in the car .

waiting ur answers.

thanks for attention

Do you have access to a multimeter or a voltmeter with a 0 to 20v scale? If so, start by checking the voltage across the battery terminals. It should be 12v, but I suspect it will be 6v or less.