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battery drain

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Old Dec 9th, 2008, 13:30   #1
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Last Online: Dec 9th, 2008 21:34
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Location: High Wycombe
Default battery drain

I have a Volvo S80 D5 (2002). I had a Warning message - relating to alarm system; followed by the battery draining. The Garage found that there is an unexplained current drain (which flattens the battery) and attempted to fix it, but nothing is apparently wrong to explain the fault. Volvo was returned to me, and then I got a new warning message relating to airbags; again battery drains and goes flat. The battery is new and the alternator checks out ok. Any suggestions?
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Old Dec 9th, 2008, 13:55   #2

Last Online: Apr 22nd, 2017 13:19
Join Date: Jun 2007
Location: Cumbria

The first thing I would do is the standard checks to try and pin down the battery drain problem (if there is one).

Get a digital multimeter and connect it to the car battery so it gives you a continuous readout of the voltage. Make sure the car doors are all shut, the keys are out of the ignition and everything is switched off. Now open the fuse box lid and remove each fuse in turn whilst looking at the voltage reading. If you remove a fuse and the voltage suddenly leaps upwards by a volt or two then you have probably found the circuit which is draining the battery.

I had this problem on my old Granada and it turned out to be one of the headlamp wipers. It was out of position and was constantly trying to reset itself. This was flattening the battery in less than two days at a time. I solved it by leaving the fuse out and hacksawing off the wipers ;-)
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Old Dec 9th, 2008, 16:39   #3
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"Make sure the car doors are all shut, the keys are out of the ignition and everything is switched off"

...and then wait ten minutes or so for all systems to shut down before removing any fuses or measuring any current draw.
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