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Re: battery drains down over night,new battery alternator...
Ck to see if you have a trunk light or under the hood light if so remove the lamps from the under-hood light and the doom light and the trunk light then put the fuse back if this fix works then one of the switch is staying open and letting the light continue to burn , if this does not fix try to get someone to unplug the wire to radio then replace fuse see if this is a fix it is a process of elimination and some times takes several tries, good luck and if you have more question feel free to ask without a volt meter and electrical knowledge this is a simple test you can do and it cost nothing but time
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Maybe the alternator is not charging the battery up well. To test, put a voltmeter on the battery, engine running. If voltmeter is less than 13.5 volts, suspect a weak alternator-have it tested. If charging system and alternator is good-charging between 13.5 volts and 14.5 volts, have the battery tested. Even though not old, it may have a dead cell. A parts store can load test it and see. If battery and alternator are both good, you may have an unintended drain on the battery. You can check this by, first charging up the battery, then leave the negative terminal off the battery overnight. If it starts good next day, there may be a drain, something like a glove box light, an under hood light, a radio amp left on. Post back if you want help with finding an unintended drain.
remove the pos battery terminal and connect a test light to the cable and battery, remove the fuses one at a time till the light goes out, remember the dome light is on when checking interior fuses. either remove the bulb or push the door button in, this will direct you to the circuit that has the problem
you have a draw hook a test light to ground cable them from cable to ground terminal on battery if the light is bright start pulling fuses until it dims, one thing most of the time its the radio so start with radio fuse
If your battery has any considerable age on it,( 2-5years), it could indicate a dead cell in the battery. If you installed an other than factory stereo then you could be getting drain there. If the battery is new, then check your battery terminal connections ensuring they are clean and tight. Also, check your battery cables to ensure they are tight at the engine block and at the starter. You might as well while you have the hood open, check the alternator connections for loose or corroded plug or fasteners.
First disconnect the battery overnight just to make sure the battery is not self discharging......if it's dead or down in charge while disconnected....time for a new one. Now.....if the battery is good....disconnect one battery cable and place a 12 volt test light between the cable and the battery post the cable had just been attached to. A bright light means a drain in the car. Your job is to remove one fuse at a time until the light dims. A dim light is OK...clock memory etc. Remember....a open car door is a drain......the dome light.....so keep them closed while pulling fuses. Also....if the fuses don't show a drain......disconnect ALL wires from the alternator....there could be a drain there. Just keep disconnecting one thing at a time until the light goes out or dims.
the problem with your car is: a battery "leak" to ground (like leaving the dome light on all night) The way to fix this is: buy a testlight at an autoparts store it will look like an ice pick with a bulb inside, then: with your battery fully charged remove the black (-) negative battery cable and connext the testlight between the cable and, the battery post (clamp to cable end then:spike to post make sure they dion't touch the car's metal parts now make sure all the accessories are off and,all doors closed etc.next pull fuses until the testlight goes off you have then found your problem area, replace the fuse that you removed and, look in your owner's manual and, identify what electric devices are on that fuse's circuit i.e. glovebox lamp, trunk lamp, lighter; etc. then just remove each item from the circuit until the testlight goes off this is will have been your problem remember that a bad lamp does not need to glow to be "on" also any tiny vs. bright glow on the testlight will indicate by how much the problem device is draining your battery