Question about 2001 Volvo V70

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Battery drains when car sits and motor is off.

This usually happens over long periods of time. to overcome the problem we take off the negative post, and the car will then start.

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I once had a similar problem with a different make of car, which turned out to be one of the battery cells. It failed to hold the charge and would go flat easily when the temperature was colder in winter. If the battery is new and the disconnection supports this, then these cars have so many relay switches and solenoids that only an auto electrician can do it by trial and error to find the leakage......

Posted on Dec 31, 2008

  • david_yan385 Jan 01, 2009

    Further to my reply yesterday, after talking to people in the know, it would appear that the V70 is renowned for the engine immobiliser to drain the battery. Apparently its quite a common problem. To check it out why dont you lock the car by the key instead of the central locking button which will not turn on the immobiliser. If the battery stays charged then you will know its the immobiliser thats causing the drain.



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I have a 2006 Ford Mustang GT. I am experiencing a battery drain which causes the battery to go dead within a few days. Ford dealer and two other mechanics can not locate problem. Can you help

This happened to me recently with my car. First; Is this happening if the car isn't use in those few days? I'm assuming the dealer mechanics checked the battery and alternator. I would look for an unusual battery drain. It's usually something that is not seen easily in the normal use of the car. In my case I had a battery drain because the light in the trunk stayed on even when the trunk was closed.

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04 Tundra battery draining overnight

Did you let the vehicle sit for 30 min. before testing ? Modules need to time out (go to sleep - power down etc.. How are you testing ? Have a ammeter inline with battery negative cable and negative battery post . Have any doors open ( door switch closed ) Key out of ignition ? How much current ? 50 milliamps max !

Dec 19, 2016 | 2004 Chevrolet TrailBlazer

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If ur car have new alternator and battery and something still draining the battery

Remove the negative battery terminal, then hook up a test light to negative terminal which you removed, just clip the test lamp to the cable terminal. Connect opposite end of light to the negative post on battery. start pulling fuses one by one from fuse box. When test light goes out, that's the circuit that's draining battery. ( let sit a couple of minutes then pull fuses). God-Bless you and your family.

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How to charge a car battery while battery is in the car

No, do not disconnect your car's cables. Connect positive cable to positive one on charger cables, & negative to negative. Attach to DEAD battery FIRST. Then attach to car that's giving you a charge. BOTH CARS MUST BE OFF DURING ATTACHING PHASE. Then the car giving you a charge must start theirs. Let both sit like this for a few minutes (usually 3-5 minutes is plenty). Then try starting your car. If not charged enough, turn yours all the way off & continue charging for longer period of time. YOU DO NOT REMOVE THE CAR's OWN CABLES AT ANY TIME DURING OR AFTER THIS PROCESS, BUT ONLY WHEN A NEW BATTERY IS BEING PLACED IN YOUR CAR.

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MR 2000 toyota would not start after sitting all winter.

the battery can be disconnected if you let it sit for more than a week. most common drain that i encounter is in the audio system. disconnect the negative battery cable and put a test light (wired light bulb) between battery post and cable end. if the light is on or even dim, start pulling fuses one at a time. if the light stays on, replace the fuse and move on. if the light goes out then you have found which circuit the draw is in.

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Honda 2004 CRV seems like it has charging problem. Replaced battery and and Alternator. Fine for 2 months, now having problems starting. Something is draining that battery when it sits in garage. ...

I doubt the actuator, but not positive. I think it would be buzzing or clicking if it were drawing current.
So new battery and alternator. Assuming no problems in the charging system, you may be right about the drain. Here's how to check for the so-called parasitic draw, or unintended drain: Having just gotten home or having run the engine a good time to assure the battery is fully charged (about 30 minutes at least), shut off the car and open the hood. If there is an under hood light, take out the bulb. Now let the car sit for a good half hour, key out of ignition, everything off, to make sure the engine computer has gone to sleep, and all systems are shut down.

Take off the negative battery terminal and hook up a test light or voltmeter between the negative cable end and the negative battery post. If there is a drain, the test light should be bright, or voltmeter will register voltage. There is always a very small electrical draw on the battery from the keep alive memory for clock, radio pre-sets, computer memory, and the security system. But this should only be milliamps (less usually than 100 milliamps-not enough to drain a battery for a long time, less amperage than a glove box light bulb would draw). The test light should not be lit, or if affected by this milliamp draw, would have a very, very dim bulb glow.

If the tester lights up bright, there is an unintended drain. To find it, start pulling fuses one at a time, watching the test light. When a fuse is pulled and the test light goes out, you have found the problem circuit. Check a wiring diagram to see what all is on that circuit to find the problem.
Now if you did not find a drain, then have the charging system checked. Good luck, hope you find it.

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Battery goes dead while car is sitting

It wouldn't be the starter. It will not draw current when not engaged. Could be a light left on, a trunk light, glove box light, under hood light-an unintended drain, somewhere. Sometimes a penny or something gets stuck in cigar lighter and keeps that circuit on.
You should check if alternator is fully charging up the battery after it has run, and then turned off. But if you don't have a voltmeter handy, try this: When you shut if off to sit overnight, take the negative battery terminal off the battery. When you get ready to start it, hook up the battery and see if battery is no longer weak. If battery is now good, you do have an unintended drain. If battery is weak again, check charging system, battery cables and connections, alternator connections-a loose connection will prevent battery from charging.
If you have a drain, turn everything off and remove key. Pull the bulb out for the underhood light. Take negative off battery again, and hook up a testlight between the negative battery cable terminal and the negative battery post. If something is pulling current, the testlight should be bright. Now at fuse panel under dash, pull fuses one at a time and watch the testlight. If you pull a fuse and the testlight goes off, that circuit has the unintended drain. Check everything on that circuit.
Hope you find the problem. Good luck.

Dec 28, 2012 | Cars & Trucks

2 Answers


Most drains are caused by door switches or hood switches not turning off lights. It could really be anything. You can either get a meter, pull off your Negative battery cable and put one meter lead on your now off.negative battery cable and negative battery terminal. Set your meter to read dc amps. Start pulling fuses one by one until the meter reads less then .5 amps or 500 mA. If you dont have a meter you can try pulling one every night until you battery no longer drains and narrow it down from there. Anything with power could really be causing this. Alternator and starters are also known for draining batterys while not running.

Oct 18, 2012 | 2005 Jeep Grand Cherokee

1 Answer

2003 Mini Cooper S sitting in garage 3 months. Battery dead. Is it true the negative contact is on some other part of the car? Very strange. Is the battery ruined now? Help.

battery may be good yet you could recharge it, and if it doesn't go dead in a day or so it probable good. or take it in to a auto parts store and have it tested.
Note: If you are going to park a vehicle for long periods of time it is wise to either start the motor and let it run for 10 mins or more once a week or disconnect the battery. I usually just disconnect the possitive side.

Mar 31, 2009 | 2003 Mini Cooper

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