Your battery may have a bad cell � have your local auto parts store �test� the battery for �load� � most do this for free; If you find the only one that wants to charge, go somewhere else. If it is not the battery then you have an overnight power drain. A light staying on, the radar detector plugged in, the DVD player plugged in, the Cell phone charger plugged in. Anyone can find the easy fixes, the hard ones are just that. These types of drains can normally only be found with an AMP meter and by going through every base circuit in the van to find what is drawing power and then determining what should not be drawing power. � To imagine the complication in this procedure, imagine you�re the water company, and someone has a leaking faucet, and you need to know who it is. So, you turn off everyone�s water and then turn them back on, one at a time until you find the one pipe that shows someone using water. Then you follow that pipe to the block it supplies, then go door to door � ETC � This is best left to someone who knows car electrical systems. A 1998 AWD ASTRO - My battery was sometimes dead. Dealer reported finding no problems. By chance, I discovered excess grease in passenger window lift track penetrated and shorts the electronic window lift motor - A warm day, at night grease gells by morning the battery would be dead.
Either the battery has a dead cell, which will require you to replace it, or something is on pulling power from the battery. Disconnect the negative cable and leave it off overnight. If the battery is dead the next morning the battery is defective. If not, then find out what is pulling power from the battery. Ignition switch may be defective.
Dead cell in battery or something is on pulling power from the battery. Disconnect the negative battery cable overnight with the battery fully charged (12.6 volts). If the battery is dead the next morning it has a dead cell and needs replacing. If however the battery is still fully charged then a light is on somewhere or a relay is stuck closed.
Something is causing a drain on the battery even with the vehicle off and nothing turned on. A good mechanic can do a drain test on the battery to see what may be draining the charge. A dead cell in the battery itself will also cause the battery to go dead. Disconnect the negative battery cable overnight and if the battery is dead the next morning it has a dead cell and must be replaced. If not look for a light that is on or a relay that is stuck.
<improved answer>Just to correct the old answer, if the CMOS battery is dead, then the computer will not turn on in order for you to reenter it the next morning. It means that the CMOS battery is getting weak, and yeah, you could replace it. <old answer>It is most likely that the CMOS battery is dead. Replace it.
Either the battery has a dead cell, which will normally drain it overnight, or something is on pulling power from the battery. If the battery has a dead cell it will have to be replaced. The easiest way to determine this is to fully charge the battery and then disconnect the negative cable overnight. If the battery is dead in the morning it has a dead cell. You may not even be able to charge it with a dead cell. If the battery is still fully charged the next morning then you have another problem. Check all the lights on the vehicle. Under hood, trunk, dome, curtorsey, glove box, etc. One of them may be staying on. Also check your brake lights. If you find no lights are on then you may have a relay that is sticking. Can be power windows, locks, seat, etc.
It can be a dead cell in the battery causing the drain. Disconnect the negative battery cable overnight. If the battery is dead the next morning it has a dead cell and needs replacing. It can also be any light that is staying on overnight. Under hood, trunk, glove box, dome light, etc. It can also be a relay that is stuck.
A battery that will not hold a charge is normally caused by a dead cell in the battery itself. The only fix is to replace the battery. To know for sure that something is not pulling power from the battery overnight simply fully charge the battery and then disconnect the negative battery cable overnight. Connect it up the next morning and if the battery is dead then the battery has a dead cell and needs replacing. If the battery is still fully charge then look for a parasitic drain on the battery. Any light that is staying on. Under hood, glove box, courtesy, brake, backup, any light. Can also be a relay that is stuck. To check the alternator connect a multimeter set to the 20 volt DC scale. You should get a reading of 13.5 to 15.5 volts with the engine running at idle.
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