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Once the car is started if the alternator is working it will charge the battery, but the battery may not take the charge or may not hold it. Batteries don't last forever. There should be a sticker on the side of the battery or the top with a letter/number like A/7 which stand for January or 07. That will let you know how old the battery is. Most parts stores will check the battery for free to see if it will hold a charge.
If you were to push start a car with a completely dead battery (where the lights have been left on for two days), it won't start. With a boost though, it should start, if the alternator is good. This is because the alternator does not have magnets in it to create the magnetic field (like a generator) it needs to start charging. Normally a battery won't be completely dead, just dead enough to not start the car, but the little bit of power left in the battery is enough to give the alternator the field it needs to start charging. Normally it is always better to boost a battery than push start a car. When boosting a dead battery, the cables should be clamped on for 5 minutes with the boosting vehicle running before trying to start the dead one. This is to allow the dead battery to get partially charged to help with starting the vehicle. Before trying to start the vehicle being boosted, turn off the boosting vehicle (to avoid frying its computer), but leave the cables on, then start the dead one. Once it starts, remove the cables, and let it run (at least 15 minutes in the summer, 30 minutes in the winter) to charge the battery. Double that time if the heater or headlights are on. The reason the alternator was able to start charging was because it drew power from the boosting vehicle battery to create the field it needed even if the battery was completely dead.
If this is a persistent problem, it could be the battery, check the terminals to ensure a good connection. If they are good, have the battery load tested, this will tell you if you need a new one. Normally a battery is good for 5 years, less if it has been run dead too many times.
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Dodge avenger battery dead?
Charge it, replace it,test the alternator,Charge it, replace it,test the alternator,
Will battery recharge after bad alernator is replaced?
An alternator is designed to keep a fully charged battery at peak level. It is not designed to charge a dead battery. Installing a new alternator on a car with a dead battery can in some cases ruin the new alternator. Fully charge the dead battery before starting the engine.
How long do you run your car after a a car jump?
I assume you mean how long to charge the battery. You should never let the alternator charge a dead battery if possible. The alternator is designed to keep the battery charged but not to charge a dead battery. You put a strain on the alternator and it can cause a diode to burn out. Drive home and then put a battery charger on the battery to fully charge it.
Why does the battery not charge?
Corroded or loose battery connections, loose alternator drive belt, defective alternator, or dead cell in the battery.
What should you do if battery was not charged before installing new alternator?
My advice is to charge the battery with a battery charger before starting the engine. You will be putting a heavy load on the alternator if you allow it to charge a dead battery. This could damage the alternator.
Can an alternator charge a car battery?
That is the purpose of an alternator. The keep the battery charged and to run all the electrics on the vehicle. However it is never a good idea to allow the alternator to charge a dead battery. This will put a strain on the alternator and may damage it.
How do you run car to charge up new battery?
New batteries almost always come fully charged. If it was not then charge it with a battery charger and do not use your vehicle alternator to charge a dead battery. You may do harm to the alternator which is not built to charge a dead battery but is instead built to keep a good battery fully charged.
How much time does it take a car alternator to charge a battery?
It varies depending on how much other electronics you are using on the vehicle at the time. Could take hours. I do not recommend you charge any dead battery with the alternator if you can avoid it. it puts too much of a strain on the alternator and may damage it. Charge a dead battery with a battery charger.
Can you charge a dead battery by getting a second car that is running take the good battery out of the running car and put the dead battery into the running car as a means of charging it?
No, this will place a very heavy load on the alternator of the car and may result in burning out the diodes of the car charging the battery. You could easily ruin the alternator. Purchase a battery charger and charge the dead battery with that. Alternators are not made to charge dead batteries.
Just installed a new alternator and belt on 1999 blazer - the new alternator is very hot your husband has leather hands and says it very hot Everything is grounded properly?
is your battery Low or poor?? Charge your battery on slow charge for 8hrs to give it a good deep charge, Installing an alternator on a low or dead battery will ruin it and also not charge your battery properly.. An alternator is not a battery charger its a battery maintainer!!
Why will the battery not charge in your 1986 grand marquis with a new alternator?
Battery may have a dead cell and need replacing.
Why is your battery not getting charge when the alternator tested good twice?
Loose or corroded connections or the battery has a dead cell and will not accept a charge and must be replaced.
