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Battery intermittent power drain

Occasionally, battery in my 2008 350e drains over night

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 113 Answers

SOURCE: Battery drain

When the car is shut off, there should be a very small load on the battery to keep the clock running, the security system on etc. But the amount of current is really small. If the battery is dying overnight, something is loading it;
Charge the battery right up.
Have ignition off, doors and trunk closed, no interior /exterior lights on and leave the driver door window open.
Take a fairly large automotive bulb like an 1157 or even a headlamp.
Disconnect the negative terminal on the battery.
Connect one wire to the negative terminal of the battery from the light, and the second light terminal to the negative battery cable you diconnected; connecting the light in series. Don't put the negative battery terminal on the battery.

The bulb should not light if all your ignition system is off and you have no lights turned on.

Turn on the lights or blow the horn by poking through the open window without opening the door, the test light should light and the horn sound.

If the light lights without anything being on, then you have something constantly draining the battery.

Go to the fuse panel and remove and re-install each fuse one at a time from every circuit. You may have to close the interior light door switch by pushing it with something while you are getting to the fuses so the circuit is in the off state all the time. Everything has to remain off.

When the light goes off when you removed a fuse, that is the circuit which is loading the battery. Check the fuse description for the circuit affected.

My guess is a trunk light that stays on even when the trunk is shut. If it is a lighting system fuse causing the problem, remove the trunk bulb and replace the fuse. If the light goes off, the trunk switch is defective keeping the light on all the time.

You can also place a battery charger on the battery (connect the negative back on the battery) and go and check the car in the dark. Is there a light on like a floor lighting in the interior? Do you have a light on under the hood that can't be seen during the day?

Always make sure you have a good charged battery, and that the terminals are really clean before you start analyzing the problem.
Does the alternator charge the battery? Check by measuring the volatge across the battery engine off, no charger connected; should be 12V or close.
Start the car, the meter should read 14V or so, but more than without engine running. If not, the alternator/charging circuit may be the real problem.

Posted on Aug 24, 2009

  • 1 Answer

SOURCE: Audi A4 tail lights come on at night and drain my battery

its the sensor in the brake pedal, happens mostly at cold nights since cold weather loosens up the pedal it causes the pedal to go down by itself if like you were braking, I used to roll up the matt and put it underneath the pedal and that would put pressure upwards while i was researching on how to do it myself found out is complicated and decided to take it to the mechanic for a 200$ fix.

Posted on Jan 25, 2010

  • 8404 Answers

SOURCE: Cars battery drains every night. local car repair

One by one, disconnect the fuses until you see no change on a volt/ohm meter connected to the battery with the engine not running.

Posted on Mar 06, 2010

daves944
  • 1050 Answers

SOURCE: Own a 2005 BMW M3, car battery draining -battery less than year.

From what you're saying here, I believe that you simply have a bad battery. Most batteries only last 5 years, much less if they're left to sit in storage periodically. You really should charge the battery overnight and do a load test on it the next day. The person(s) you spoke to at BMW were probably sales staff and not actual technicians. Costco has very good batteries at reasonable prices.

Posted on Mar 24, 2010

  • 417 Answers

SOURCE: 2002 Jeep Liberty Intermittant electrical problem - battery light

Have the alternator, regulator tested for shorts/malfunctions. Hope this helps.

Posted on Apr 26, 2010

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Something is draining the battery on our 2002 bmw z3.the battery and alternator checks out good,what is draining the battery??


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Have a 2009 Saab 9.7x4,2i starter good alternater good but battery dies over night


Usual culprit is boot (Trunk) light.If not, try disconnecting battery and if a spark jumps as you take the lead off it shows there is a power drain. If no power drain it points to a faulty battery.

Feb 22, 2015 | Saab Cars & Trucks

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What causes intermittent starting?


sounds like a parasitic load on your battery. it will drain voltage from your battery continuously at a slow rate so while car is sitting over night it is drained but when you get it started in day the alternator is able to maintain battery voltage. could be something as simple as a visor light not turning off when closed or glove box light not turning off when closed or alarm system drawing excessive power.

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Drain battery


Someone will need to pull the fuses and disconnect the main circuits until you find the power drain. Could be a short to ground or something stuck on.

Feb 03, 2014 | 2002 Chevrolet Malibu

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40 amp fuse labeled 'Fuse Block' is causing a 3.5 amp parasitic draw and draining battery


??? are you certain its that ??? that fuse will most likely control all the power in the fuse box and the 3.5 amp you see that's called the parasitic draw will most likely be that of the cars computer..

3.5 amp wont drain a battery over night nor in a week i'm assuming you have at least a 500CCA battery here.

battery's don't drain like that, they do loose power once they have a bad cell, or the battery water is low. I'm assuming you had it tested here by a technician from the battery shop and that's what they told you and its a new battery or relatively new..

to test this your self you can take the battery out of the vehicle and leave it outside over night, you will see the power is drained out and it wasn't connected to anything. Thats because of the bad cell..

To prove it to them, Remove the caps If its not a sealed maintenance free one and you will see bubble coming out of the bad cell once the car is idling.. (don't inhale the fumes or let it get in your eyes)

Dec 29, 2012 | 1993 Jeep Grand Cherokee

1 Answer

My Jetta's battery died - my husband replaced the Alternator as well as the battery since the Alt was draining it - now if you disconnect the negative post at night, then re-attach in morning it will...


you better check the relays or replace them all and see whats happing
alternator will never ever drains battery it just could not be able to charge it but it never drain
what makes drain in battery cold be anything consume (not produce) power

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Battery died, replaced 3,three,111, days later.now Ihave no ing. or starer power


Something is draining the battery, Is the battery drained after sitting over night or within driven miles. If it drains over night power is being puled from a source, or the voltage regulator inside the alternator is pulling the power and draining you battery.

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1 Answer

Battery drains when car is on. Verified it is not


Sure sounds like a bad alternator to me-how did you verify the alt is okay? It should be putting out around 13.5 volts. Let engine idle-remove positive battery cable-if engine dies immediately, it IS the alternator.

If the alternator only puts out about 12/13 volts, the car's voltage consumption could be exceeding that; hence, intermittent charge/battery light.

The battery has 12.6 volts. The battery/charge light will come on if your car's voltage requirements exceed that. (Alternator pulley not spinning fast enough?) Loose alternator belt slipping could also cause this symptom.

Alternators CAN go inoperative intermittently.

Hope this helps.

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You have either a battery with a dead cell that must be replaced, or something is on and draining the battery. Check the under hood, trunk, glove box, brake, parking, and courtesy lights. Open the hood at night and remove the negative cable. When you touch it to the negative battery post if you see a fairly large spark, something is on or something is drawing power. If you see a very tiny spark that is normal as it is the radio & clock pulling power. Replace the battery.

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Power drain at night


Go to http://www.hmaservice.com/ and register (vehicle by VIN). Afterward, you'll have access to technical information (manuals, wiring diagrams, service bulletins, etc) about your vehicle.

Mar 14, 2009 | 2000 Hyundai Sonata

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