A glove box light will drain a battery over night or it could be a bad diode in your alternator. Disconnect the red wire from the alternator and check with a volt meter.
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Instructions for measuring automotive battery current drain. ... Excessive current drainwill usually result in the battery running down overnight or within a few days. ... Many digital meters have a 2 amp internal fuse that may blow if multiple ... If pulling fuses and circuit breakers doesn't stop the current draw, you'll need to look ...
InstructablesApr 13, 2011 - I know this is an old question, but I that if the battery cable is not clean or .... I wish I could find one of those 14.4 Vdc 2 Amp solar chargers. ... be to pull a different fuse every night (not the ones which would require factory help ... As others have pointed out, the LED will not drain a good car battery overnight.
Welll then you have a wiring problem or a dead short in the electrical system. You will have to do some research and let us know more info before anyone can help. We just cannot guess friend.
But considering you said it was a "new Battery" that knocks out one possibility of a "dead cell" in the battery.
A bad alternator no longer charges the battery, the battery will die once it is drained. This will occur more rapidly when using equipment that runs off of the battery( lights, heater blower, windshield wipers etc.) even electronic ignition will run down a battery. Your battery just went over night the alternator may have stopped working long before. Go to an auto parts store that offers free testing to make sure it is your alternator before making repairs.
Good luck.
Check all the dome lights or the light in the trunk. One of them is on all the time. Or something else is on or shorted. Take out one fuse each night, to see what circuit is running something. You might have a bad alternator.
dear friend-the voltage that you are measuring is battery voltage and as soon as you try to start the vehicle it will drop to 9 volt which is not enought to start.if you remove the pos,battery clamp and put a test light between the pole and the terminal and and the light lites up then there is a draw running the battery flat.
there must be somekind of amp draw or else you shouldnt be having any problems,this may sound wierd,and also may be a bit of work,try disconnecting the alternator for a night and see if your problem goes away,ive run across this a couple of times,also,seat control modules are known to cause draw problems in c and clk classes
If this is a manual transmission, this is normal. Your engine is running the alternator and the altrnater runs the battery. When you disengage the clutch, the alternater slows down causing the car to run of the battery itself.
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