[928uk] Another Battery Question

[John Bevan]

Owen
Bit late in responding, but this might help. I had a battery drain problem,
which turned out to be sticking relay from heated rear window, as mentionned
below.As the bulb in switch had blown, I had no way of knowing it was always
on ! New relay is about £80 from OPC, but Paul A had a reconditionned one,
at a fraction of that cost. Might be worth a look. You can also reset it by
turning engine off and then re-cranking it.
Regards
John
White 83 S2
----- Original Message ----- 
From: <ukkid35 at breathe.com>
To: "928UK" <928uk at 928.org.uk>
Sent: Thursday, April 01, 2004 3:17 PM
Subject: [928uk] Another Battery Question


>
> I am always puzzled by these battery drain queries. The battery in a 928
is
> larger than just about anything you find in a petrol engined car, from
> memory 72 Amp Hour. This means it should take a month for a current of
50mA
> to half drain the battery, which should still leave enough to start a
> healthy car on a winter morning. I'm guessing that a properly installed
> alarm/immobiliser should drain less than half that. However to be sure I
> will check and report back what the current drain is on my car which has
two
> immobiliser/alarm systems fitted (one by Porsche? and a Laserline system
by
> a PO), both which need to be deactivated to start the car.
>
> I honestly believe prevention is better than cure (lesson learnt from my
cam
> belt experience) so if your battery can only last a few days before
failing
> to start the car, you need to know what is draining it. As Kingsley said
> http://www.nichols.nu/tip800.htm is a good place to start.
>
> Possible canditates also include sticky Rear Window Defrost relay, as well
> as bizarrely the memory seat function (perhaps this is because the servo
> can't find the right position and keeps trying to correct). Also check
that
> none of the interior lights are set to permanently on.
>
> I really can't see why a battery conditioner should be neccessary unless
> either you live in Alaska or only drive your car very short distances at
> night once a month.
>
> Paul
>
> 87 S4 Manual
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