My battery is charging while driving,because car will start 4-6 hrs after driving. If it sits overnight battery is dead. New battery,tested good. Took cable of battery while running alternater kept car running. No dimming lights or problems while driving.
My car has 90000 miles.
My car has an automatic transmission.
The first thing is to never disconnect the battery with the engine running or you may damage computer or charging system due to overcharge condition. If your battery is going dead after sitting for longer than 6 hours then you may have a draw on battery from many different causes like stuck on fuel pump relay or interior lights left on. The vehicle will need to be checked for voltage draws from alternator or other electrical component by a mechanic like one from YourMechanic.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing