You can have the alternator tested free of charge at just about any major auto parts store. By the way, a bad alternator will not "discharge" a battery - the alternator's function is to provide the charge to the battery. If the alternator is faulty, then it is not providing the charge necessary to keep other components from discharging the battery. I had the alternator tested and it was charging. If the alternator has a bad diode, it will discharge the battery. I replaced the alternator and everything is fine.
Battery may have a dead cell and need replacing.
If the battery was charged when you installed it, you do not have to drive the car at all. If not you should charge the battery and not use the cars alternator to charge it.
The alternator charges the car battery.
The battery has a dead cell or short and needs replacing.
A battery charges nothing it accepts a charge from the alternator.
I'd suspect the alternator. The vehicle can run off a minimal battery charge, but if the alternator has failed the battery will eventually discharge. Understand that a battery is simply an electrical energy STORAGE DEVICE. The battery is there so that the engine can be started, but once the engine is running the alternator is supposed to re-charge the battery, replacing the electrical energy that was used to start the engine. BTW, automotive batteries are not designed for "deep cycle discharge", and you should try to avoid that if possible.
alternator probably needs replacing not charging battery or bat is dead and not taking charge
Charge the battery.
older cars had a generator ,not an alternator, but you can always use a battery charger to charge a battery
Connect a battery charger to the battery and let it fully charge. Do not charge it with the cars alternator. If it will not accept a charge the battery needs replacing. Connect positive (+) red cable to positive post and black negative (-) cable to negative post. Trickle charge the battery do not fast charge it as the charge won't take. Sure it will start the car a few times but a good charge to a battery is one that is done slowly
=== === Some types of electrical shorts do cause the battery to discharge. But usually a bad alternator just does not charge the battery. Or does not put a large enough charge back into the battery. This causes the battery to discharge when you start and run the motor. The spark plugs and other things need electricity that would usually come from the alternator is now coming from your battery. If your bad alternator is not recharging the new battery, the battery will soon fail to start or run your vehicle. You need to have your alternator tested. It should be putting out at least 12 volts, usually around 13 to 15 volts.
Charge it, replace it,test the alternator,Charge it, replace it,test the alternator,
Without the alternator in operation, everything electrical will only run from the battery, which will discharge rather quickly at which time the car will cease to run. Without any charge in the battery, the car won't be able to be started.
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.
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.
put in new alternator but it will not charge battery. alternator was tested and found to be good. why wont it charge the 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.
No, the alternator is the charging device which runs off a belted pulley attached to the motor. The alternator charges the battery which is the source of the current required to get the engine turning over and in turn starting the engine.
No, the alternator recharges the battery. Of course the alternator is turned by the engine.
Yes, the battery starts the engine, and as long as the battery is fully charged the engine will start. The battery will loose it's charge if the alternator is defective and not replenishing the charge of the battery but the alternator has nothing to do with starting the engine.
They will run somewhat hot while charging; if you put your battery in discharged however, that makes the alternator work much harder. A alternators job is to maintain the charge in a battery not to charge a discharged battery.Keep a eye on it, it will probably be OK once the the battery is topped off.
you need the alternator to charge the battery with no alternator when the battery drops to about 10 volts car will not run at all.
Repair the alternator to battery connections or replace the battery.
The official charge of a battery is measured by the specific gravity of the electrolyte. For a good battery and alternator, full charge is noted when the alternator output current is just enough to carry the load, plus a bit to maintain the battery, and the battery voltage is normal.