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


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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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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.
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However, if it does start, that's normal.

On a car that old, I would check that the battery cable ends are squeaky clean, wire brushed, or even replaced if cleaning is not possible.

Usually, a battery that is tested good will be good under a load test.

Also, try to use an ammeter to find out if there is a drain on the battery above .2 A while it sits there turned off. This could lead to a solution if you investigate where a short may be.

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