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Why battery goes dead overnight - Cars & Trucks

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Something is either draining it or you need a new battery. you can check to see if something is staying on by taking out the bulb under the hood and turning off everything else like you would normally. then remove the negative battery terminal. if it sparks then something is drawing power. start pulling fuses one at a time and retest for spark at the battery terminal. your radio my be drawing power to run the clock which is normal. once you find which circuit it is, example interior lights, you will then have to find out why it is staying on. (door switch)

Posted on Dec 09, 2014

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Something is still connected after you shut off the truck and it is draining the battery. Finding it is a trial and error process of disconnecting things until you find the problem.
First, have you added anything to the truck and then after that the problem started? If so, check that first or any wiring near where whatever it is was installed. The usual issue is that a hot lead that is always on is now grounded and that is what is draining the battery.

Posted on Dec 09, 2014

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mkv0525
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SOURCE: 99 mercy sable theft light keeps binking battery goes dead

you have a bad cell in your battery or a major draw on electric system. I would have the battery tested first.

Posted on May 27, 2009

  • 8 Answers

SOURCE: new battery, new alternator, new starter. Battery

Something is draining the battery most likly a short somewhere in the electrical system. You will need to have it looked at by the garage to find the short A temporary or cheaper solution may be to disconnect the battery when not using the car. You can either fit a switch inside the car or physically disconnect it at the battery.

Posted on Oct 16, 2009

Testimonial: "fast response, very helpful"

wilsodfarm
  • 986 Answers

SOURCE: battery goes dead overnight on four occasions

I dont think the dealer knew what he was doing ,your altenator has 6 diodes inside it and the are a one way check valve for current,If one fails no light will come on because it is still charging,But will drain your battery,I hope this helps you and have a merry x mas and please dont forget to vote on this solution

Posted on Dec 19, 2009

fieromudder
  • 132 Answers

SOURCE: battery goes dead overnight unless

I would try unhooking the alternator for a night. have you added an aftermarket radio? security system? something plugged into your cig lighter? dome light on? brake lights on?

Posted on Nov 05, 2010

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skychief2001
  • 21873 Answers

SOURCE: 07 Honda Ridgeline Battery goes dead overnight - new battery

Thats probably your current drain.
See if you can find the relay and what it controls.
Pull it out and see if the current drain stops by using a test light between the battery and one of the cables.

Posted on Mar 06, 2013

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2008 dodge grand caravan dead battery


More info please, such as after sitting for a couple days, just overnight, etc.

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I have a 99 ford expedition eb ive had the battery n alternator tested both reading at the right volts but the battery keeps dying.... ive made sure every thing was tight n where they should be n...


If the alternator is charging the battery, and it goes dead overnight, you have a short to ground in the wiring that is draining the battery.
You can try disconnecting the negative battery cable and see if the battery stays charged when the engine is off.
If it still goes dead, the battery could have a dead cell.

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Have a 1994 blazer s10. keep replacing batteries and they go dead within few days! Where is a common short?


I'll start by saying if a battery goes dead you should be able to recharge it without having to replace it.
If it goes dead overnight something may be draining it, or the alternator may not be charging enough.
A mechanic would check alternator output and check all of the circuits for a power drain.

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Have a battery drain issue overnight


The antenna has failed & needs to be replaced

No relays,you said open,open means no connection
or current flow.

Relays seldom fail but sure are talked about more than face book
or I-pads

You provided no vehicle,make,model,etc

A bad horn switch,clock spring under steering wheel ?

Some times you have acc modules that time out after the
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BATTERY IS GOOD SO IS THE STARTER AND THE ALTENATOR WHY DO I KEEP HAVING TO HAVE JUMP STARTS? 1997 FORD ESCORT


How long does it take for the battery to go dead, overnight, couple of days?

Have you checked the electrical system for draws? You'll need a multi meter capable of reading amperage. Disconnect the positive cable and hook the meter up in series with the battery and the positive cable. You want to make sure the key is out of the ignition, all the doors are closed and all the dome lights etc are turned off before doing this. If you get a reading of more than .050 amps than you have a draw. You may have to wait for 20 minutes or so for everything to power down to get an accurate reading.

If you have a draw of more than .050 amps than you can start pulling fuses one at a time until the draw goes away and then focus on the things that fuse supplies power to. Make sure you put the fuse back that you pulled out before pulling the next.

If there are no draws and the battery goes dead overnight disconnect the battery, let it sit overnight and then see if the battery will start the vehicle in the morning. Every once in a while you will run into a battery that has an internal draw and will run itself down all by itself.

Sep 27, 2010 | 1997 Ford Escort

1 Answer

Have a 99 cadillac sedan deville. lots of


you need to verify the dome lights are turning off before you walk away,something is draining the battery.check you car out after driving it and make sure radio and any other things all shut off.

Dec 28, 2009 | 1999 Cadillac DeVille

3 Answers

Battery goes dead overnight on four occasions


I dont think the dealer knew what he was doing ,your altenator has 6 diodes inside it and the are a one way check valve for current,If one fails no light will come on because it is still charging,But will drain your battery,I hope this helps you and have a merry x mas and please dont forget to vote on this solution

Dec 19, 2009 | 2009 Hyundai Genesis

1 Answer

99 mercy sable theft light keeps binking battery goes dead


you have a bad cell in your battery or a major draw on electric system. I would have the battery tested first.

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