Question about 2004 Mini Cooper

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Battery Keeps draining

I have removed all cabin boot and footwell bulbs.
The car holds it charge when running so batteyr is ok.

The car does little milage, but something is draining the system.

Any ideas to identify the problem

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  • vukes Oct 29, 2008

    If I leave the car for a week while on vacation, I disconnect the positive terminal, and it will then be OK, but if I leave it on, there is a power drain, and the battery will be dead upon my return.  Mini needs to address this problem! What is the drain? Is there a fuse I should take out?

  • Robert McClure May 11, 2010

    how old is your battery, you might need a new 1

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  • Mini Master
  • 21,936 Answers

Fit a battery isolator switch

Posted on Dec 06, 2008

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How long have u got to charge it for for 1st use because I charge it all day when I turn it on the next day the battery kept going down I'm still charging it


A new battery comes charged well enough to start the car, if it keeps going flat u have a problem either with the charging system or a power drain, so once car is turned off sonthing is staying on draing the battery. Or the battery could be faulty but very unlikely. To check the charging start car and put a volt meter on the terminals of the battery should be reading aprox 14.2 v if it only reads 12 something then u have a charging fault. If charging fine then have to test for a power drain and the easiest way to do that is to open bonnet or boot depend where battery is lock the vehicle up and wait about 20 mins for the car to shut down Ecus etc remove earth terminal off battery and put a 12v bulb from the earth terminal of battery and the earth lead if the light shines u have a power drain remove each fuse in turn remember to put it back after until light goes out then u have the offending circuit. Hope this helps

Jan 23, 2015 | Cars & Trucks

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I have a vw beetle 1966 model. I bought a new battery for her and in every two days the battery gets idle, discharges the charge. why it happening? the altenator or the dianama working fine.


There may be a light staying on and thus draining your battery. If there is a bulb in the trunk, check whether the switch works. The same applies to the bulb in the cabin.

Oct 25, 2013 | Volkswagen Cars & Trucks

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Battery keeps running down


get the battery cheaked most motor shops will do this free but if battery ok could be a short or alternator not charging

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My battery keeps dying and I just bought it new a week ago. The alternator is also pretty new. It seems to be something with the wires or a loose connection of some sort, but I just can't figure it out. ...


If your battery is dying over the course of time, you may have a drain of some sort on the battery when the car is off. You need a volt meter, which you can pick up at a parts store or at Walmart for as little as ten bucks. With the car off, you should read around 12 volts across the battery terminals. It will vary a little bit with temperature. Then, with the car running, you should read one or two volts higher across the terminals. If that checks out, your battery is being charged by your alternator.

Let your battery charge with the engine running for a good 20-30 minutes--ideally while you are driving without the radio or headlights on. That should give you a decent enough charge. Now, assuming that your battery cables are tight and that they are not damaged or corroded, your new battery should hold a charge. If it doesn't, the next step is to check for lights or accessories that are draining the battery with the car off.

Dec 13, 2010 | 1993 Mercury Tracer

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I changed my alternator and battery they both test as good but my car wont charge the battery it keeps shutting down like the alternator is bad the horn is clicking and the airbag light comes on just...


Might be anything, but before going further I wish to check and clear three most common factors:
There are 3 most common reasons for the battery to drain.
You have to check these one by one.
A bad charging system.
Start the engine, and with a multimeter, or Volt/ Ohm meter, set at 20V DC, measure the voltage between terminal (+) at the battery, and a good ground. The reading should be 13.8 V to 14.2 V. If this is O.K then you have to check the battery.
Stop the engine and check the voltage between the (+) and (-) terminals of the battery. If the voltage is 12.6Volts than the battery is fully charged. If it is 12.45Volts the battery is 75% charged and so on. A bad battery is not able to hold the charge anymore, and need to be replaced with a new one.
The third reason is a phantom voltage leak.
This is a parasitic electrical drain on the battery, because a relay is sticking, a module is not shutting down, or there is a shorted diode in the alternator. To check this you need a bulb 12V 1 Amp, connected with two wires and two alligator clips. Disconnect the harness from the positive terminal of the battery, and connect the bulb in serial, with positive terminal of the battery, and with positive harness of the car. Make sure to create solid contacts with alligator clips. The car electrical system hates sparks, which you have to avoid. As soon as you connect the bulb, the system might sink up to one Amp of electricity. This happen because the modules and computer starts learning, but soon the current will decrease in milliamps. If not then you have parasitic electrical drain on the battery. In this case you have to remove and put back in place, one by one all fuses. If the light shut off then you have located the problem.

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1 Answer

Battery keeps dying, it's alternator was replaced in August and a new battery, so why is there a problem now ?


You may have another Alternator issue so get the charge rate checked. Then, look for a leakage issue like the glove box lamp staying on, or the lamp in the trunk or boot staying on. I have even seen the lamps in the footwells stay on and drain a battery overnight.
An easy test is to use a test lamp. Make sure all the doors are closed and everything is turned off (tail lamps etc). Disconnect the battery negative and connect the test lamp between the battery post and the cable clamp. If the lamp lights and stays lit, you have a leakage. Begin by disconnecting the courtesy lamps or removing the bulbs. When the test lamp goes out, theres ya leakage. If you have a charging system connected to the vehicle which charges a second battery, like one in a caravan, check those circuits too.. And even though the Alternator is new, it may still be the cause of the problem.. So check it out as well..

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1 Answer

I need to replace a cabin air filter for my 05 odyssey. How do I take off the glove box?


You first open the glove box remove contents, on each side you will see a black plastic tab that is what keeps it from openin to far those just pop out you have to hold glove box shut a little pop them out then just wiggle them out its easy. Then shut the glove box there should be a couple hinges at the bottom maybe three remove the bolt that hold them on then open glove box and take it off. Ok know for the bad news that bar that the glove box bolted to you have to remove it or the cabin filter wont come out just tal the bolts out that hold it on there will be one on the passenger side that is in backwards its not that bad the one on the closest to the driver side that is in backwards can be a little trickey. I have seen some just leave that one in and bend the bar slightly, but I always remove it the about in the middle of where the glove box was you will see a black slender cover that runs up and down it jus pops off you will be able to tell by the tabs on the top and bottom. then just slide the cabin filter out and remove any leaves or debris if there is any replace cabin filter make sure you put the airflow going the right way should have arrow on it. Then replace in reverse order.

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1 Answer

Battery power -


Alternator might be bad, or is going bad. I assume you're using a stand-alone batter charger to recharge the battery? If so, you'll need to replace the alternator, as it's not performing the function of recharging the battery. If you take longer trips, the battery might run out of juice and the engine might stop.

If not the alternator, you definately have a short somewhere else that needs addressing.

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3 Answers

My range rover baterk keeps going flat overy nighy


if the battery goes flat overnight but works fine when driving there are only two possibilities. either the battery is faulty and not holding charge or there is a current drain on the electrical system when standing. have your battery drop tested if ok check that current drain does not exceed 50 miliamps with everything switched off . common causes of drain are boot lamps, glove box lamps, faulty relays, faulty cigarette lighter sockets,and leaky diodes in alternator. to check for these try pulling fuses one at a time to find the faulty circuit. hope this helps

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