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Battery drain overnight

Battery drains and the battery is good

Posted by Anonymous on

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

gripfitter
  • 557 Answers

SOURCE: Battery drains overnight.

Alternator. The regular inside the alternator has an open diode. Disconnect the battery overnight and it will start the next morning. The alternator will need to be replaced to fix the problem.

Posted on Dec 23, 2009

Mike258
  • 1498 Answers

SOURCE: something is draining my battery

Hi there,

This response contains troubleshooting procedures designed to locate the cause of an overnight power drain resulting in a dead battery, It assumes the charging system is working.

The first (and easiest) test I run is on the battery.

When you are done using it for the evening, pull the Negative battery cable.

In the morning, re-connect it. If it's dead again, the battery need replacement. This does not necessarily mean you found the problem.

If it starts, the battery is ok. It's time to look for the power drain.

With the ignition off, ensure the systems that should be off actually are off. For example: does the radio still come on? Wipers? Etc.?

In the same vein, has anything new been installed lately?

The next test is a lot more tedious. You will need a test light, needle nose pliers (to pull fuses) and the proper tools to remove the negative battery terminal (again).

  • Ignition off
  • Remove the cable from the Negative battery terminal
  • Hook one end of your test light to the Negative battery post
  • Attach the other end to the cable you just removed
  • Again, double check connections to recent installations (radio, GPS, etc)
  • If it lights up very faintly, this is likely the normal drain of the clock. The brighter the light, the bigger the drain.
  • Find your fuse box
  • While keeping an eye on the test light, pull the fuses one by one. Replace the one just pulled before going to the next.
  • When the light goes out (or dims), you will have narrowed the the problem to a specific system. Check the legend on the fuse box for the offending fuse.
At this point there are too many 'What if's'. Which system has the drain will determine the next steps to be taken.

This procedure will allow you to focus in on the problem area. Let me know what you find out.

Hope this helps

Mike

If you found this helpful, please take a sec and rate this response. Thanks.

Posted on Jul 24, 2008

  • 71 Answers

SOURCE: battery drain

650 milliamp is too much. The Beetles had problems with the microswitches in the door latches that tell the convienience module if the doors are opened or closed. If it doesn't see the right signal the computer wont go into sleep mode an it will stay powered up draining the battery. VW techs can check the output of these switches to see if they are working right with their scan tools.

Posted on Dec 11, 2008

  • 6 Answers

SOURCE: BATTERY DRAIN

Do you have any stereo equip? Amps? Subs? Aftermarket CD player?

Posted on Dec 19, 2008

  • 320 Answers

SOURCE: 1998 Corvette drains the battery in less than 2 days.

No, corrosion will not cause a battery to drain, even if the corrosion is on the terminals. Several factors can cause battery drain, I would first have the battery tested to see if the battery it self is not bad. If the battery is good, then the most common is a short. All most all new cars have a certain amount of drain,(measured in milivolts) this drain is for clocks and computer memory's, and it would take several days of a vehicle sitting for the battery to be drained. Don't immediately assume you have a problem if you see 2-6 milivolts of drain on a battery with the key out, now if your battery is being drained after being parked over night, you have a problem. The easiest way to pin down the problem short is to disconnect your positive battery cable from the battery, take a 12 volt test light and clamp one end to the positive cable, and hold the probe to the positive post. Now if you have a short the light will come on. Have someone help you by pulling the fuses one at a time. If when a fuse is pulled the light goes out you have isolated the short to that system. If you pulled all the fuses and the light never went out try disconnecting all the wires from the alternator, 9 times outta 10 do this will let you know where your short is. If the system is not critical like power locks some people just leave the fuse out. 

Posted on Mar 05, 2009

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1998 Ford Taurus battery light on battery drains overnight


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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 ...

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1 Answer

What possible way can check to tell if my overnight battery drain is due to the diode sticking? Is there a test or a tip you could offer? The battery is new and the alternator tested ok.


A diode doesn't "stick". Either one of your circuits is using battery overnight, the battery is defective, or it's not charging.

Assuming the battery is "good", pull all of the fuses overnight. If it's good in the morning, put all the fuses back in, and next night leave one in. Next night, the next fuse, etc.

Once you know which circuit is draining your battery, you can troubleshoot further.

Sep 15, 2015 | 2008 Pontiac G6 GT

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Battery drain overnight


Usually if battery is good. Its usually a parasitic drain. You can use a standard multimeter, and put across each fuse top. Two little tips. If you see a voltage even a little bit. That's a drain. Find what fuse go's too. And diagnose.

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The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
Also,do an overnight battery check by disconnecting the battery overnight,if things are fine the next morning after the battery was disconnected then it is a drain in the vehicle,if the battery is dead even after being disconnected overnight,,then the battery is bad.

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Light on dash reads "check


nancycmixon, When you see this "check your charging system" you need to have the alternator checked. This is the main component for the charging system. A normal alternator will put out 13.6 to 14.6 volts. A few tenths of a volt either way won't mean too much but if they are extremely over or under these values means you have a bad alternator. I believe that your vehicle has a voltage meter in the dashboard and it will usually read in the thirteen to fourteen volts range. As far as your battery losing its charge overnight means that you have another problem and that is you have what is called a parasitic drain. There are a certain amount of parasitic drains already in the car with the radio memory and maybe a clock that constantly displays the time and the antitheft system in the car. These will not drain your battery overnight. You have something else draining your battery that is your problem. Have the alternator checked and mention the battery drain. There is test for this but it is too lengthy to post here. Sorry about that. Good luck with this.

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This should be done with everything turned off and the door closed. with negative battery disconnected. place 12 v test light between the battery terminal and the cable end.(on neg. side) if the light lites up there is a drain. remove one fuse at a time until u see the lite go out. that is the sytem the drain is on. usually glove box light or trunk light or visor light left on or stuck on.

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2 Answers

Draw on battery when car on


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.

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