Alternators have a built in regulator that keeps the voltage at about 13.5 Volts. Depending on the load, the alternator may be putting out anywhere from just a few amps to full capacity of over 100 amps for some alternators. Batteries charge at anything over 12 volts and handle about 14 volts without any problem. You start causing problems for your battery and other parts of your electrical system when the voltage goes over about 15 volts. But then, if your regulator is working right that should never happen.
The current (amps) of an alternator does not vary. if it is a 100 amp alternator, the amperage coming out is always 100 amps.
faulty voltage regulator
The alternator produces power to charge the battery. The battery powers the starter to turn the engine over.
It will start if there is enough charge in the battery to turn the engine over. However if the alternator is weak then the battery will not be charged fully.
A battery charges nothing it accepts a charge from the alternator.
The alternator charges the car battery.
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.
Sure, if the alternator voltage regulator is defective it can overcharge the battery.
older cars had a generator ,not an alternator, but you can always use a battery charger to charge a battery
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.
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.
Charge the battery.
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!!
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?
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.
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.
Repair the alternator to battery connections or replace the battery.
your alternator is not charging your battery..u need to get a new alternator
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.
No, the alternator recharges the battery. Of course the alternator is turned by the engine.
The battery may be defective and not able to take a charge.
Corroded or loose battery connections, loose alternator drive belt, defective alternator, or dead cell in the battery.
If the alternator fuse is bad, the alternator is not going to work properly to charge the battery. An alternator runs off the serpentine belt, with graphite brushes inside that conduct electricity to charge the battery.
The alternator does not hold a charge. It charges the battery. If it will not charge the battery then either the alternator is defective, battery is defective, or the connections are corroded or loose. You should read 13.5 to 15.5 volts at the battery with the engine idling. Check it with a DC volt meter. If you get less the alternator is defective. If you get much more the voltage regulator is defective.
With a battery charger or alternator.