These charging devices are designed to feed electricity into a dead battery at the rate necessary to safely and deeply charge it without causing any damage.
Car battery completely dead no lights.
Driving a car with a dead battery can also damage the alternator.
But if your car doesn t have this feature your headlights may stay on until you either turn them off or till your car battery is completely drained.
Five signs of a dead car battery no dome light when opening the door or no door chime with keys inserted.
There should be a sticker on it that tells the month and year it was made.
Many newer vehicles have headlights designed to turn off after a certain amount of time.
It is not the battery or the alternator unless the white box in the trunk of the car that has a circuit board in it and many wires that lead into this box can fry the alternator or the battery while the car is off.
Now after few minutes have elapsed you should start the car with the flat battery.
If the battery is totally dead you won t hear a chime or see the dome light at all.
Provides power necessary to start the vehicle and powers accessories when the engine is off.
Fuses and fusible links.
With a seriously depleted battery the best thing to do either before or immediately after a jump start is to connect it to a dedicated battery charger.
Sounds like the battery is dead.
If your car battery keeps draining the first things to check are your lights.
Could be many things.
As you may know the alternator charges the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator pulley.
Lights will typically dim and the engine may die.
It sounds like you may have a weak battery a failing voltage regulator or failing alternator.
Start the car which has the good condition battery and the dead battery would start charging.
If the battery is totally dead you won t hear.
Continue doing so for a few minutes.
If it does not work then let the charging continue for few more minutes.
Check to see how old it is.
If the battery is very weak the dome light may appear dim.
Provide a failsafe if something draws too much current.