Battery keeps running down

if you installed a new battery as well as a new alternator, it should not go dead overnight. if you have a short in the vehicle that will drain a new battery that rapidly, the cable would have been melted already. although, dome lights do have a tendency to drain batteries, but not overnight. use a multimeter to check the battery voltage while the motor is running. it should read above 13 volts DC signifying that the alternator is indeed charging the battery.

was the key stuck in the ignition before you change the battery? Is it the right key or it a fresh cut key

the most common cause of a battery running down can be traced to lights that are on when the ca r sits overnight, check your glove box and make sure that the light inside is not staying on when you close the door,check the light switch to make sure it is working properly and turning off when the glove box door is closed.

diode pack on the alternator is most likely suspect ,alternator will charge but drains to earth when not running ,pull the big terminal lead off and see if it goes flat overnight

Hi!!

Batteries over time loose capacity to hold charge. You can jump start the vehicle in the morning and run around all day, but the next morning it won't have enough charge to start up.

Take vehicle to an AutoZone to have charging system and battery checked up at no charge. There are other autopart stores that also offer this free service to their customers..

Don't forget to rate this post. Good Luck!

You will burn out your alternator if you keep on doing this.The alternator is not a charger. If you have a dead battery you should always charge it overnight on a charger.To keep the battery fresh all that you have to do is disconnect the terminals.Yes this is normal because the car has clocks and alarms that drain power even when the key is off. If you let the battery set to long while it is drained it will not take a charge.

Check all your connections at battery to make sure they are tight, and clean, but my guess is it will probably need to be replaced, unless you have a large current draw happening. Stop in to an Autoparts supplier, or your preferred repair shop and ask them to test your system, as in battery , and ask them to double check that there isn't a large draw when engine is shut off. Sounds like alternator is o.k. as it is charging battery, but battery isn't holding charge, and a quick test by knowledgeable technician will confirm whether it's battery, or something drawing it down. If you happen to have another good battery you can try for a day or 2, that will also tell you.

It's typically either a discharged battery or a poor battery connection. Batteries are only an electrical storage device. If the alternator isn't keeping the battery adequately charged you could have the problem you describe. But rather than running right out and replacing the battery, first charge it and see if it will hold a charge overnight. Sometimes, if something is left on inside the car it will run the battery down sufficiently to cause what you describe. Other times it's the alternator, dirty battery terminal or even a worn out battery, but you can't know until you test these components.

once the car is started it runs off the alternator .. so even if your battery is bad the alternator will still run the car .. so it looks lilke your alternator is bad .. when you jumped the car you charged the battery a little but not enough to keep it going since the alternator is not charging . if you hook up a charger overnight then you might be able to run it long enough to get somewhere (garage) .. try to drive when you dont need lights .. those will run down the battery in a short time .. if you have a volt meter then the battery should read about 13.8 to 14.2 volts when the alternator is working properly (car running) .. if it reads lower (like 12volts or less) then the alternator is not charging .. some auto parts stores will test your system free ..

get rid of it