Question about 2000 Toyota Corolla

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Flat Battery Battery keeps going flat if not driven for a day,especially now that it is winter. Have disconected the boom box. I did jump start it twice, but have dammaged the good car battery. Had to replace it. Is there an easy fix or next step auto electricion? Is there a special jump starter for modern cars. I have a 2000 Pajero/2000 Corolla. I need some thing for my daughter to use in my absence.

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  • Anonymous Jun 16, 2008

    I'm a qualified electronics engineer so I understand volts and amps. Car electric systems haven't been designed, they've evolved. The alternator keeps a nice constant voltage of about 14volts across the battery, unfortunately that doesn't define in any way how fast charge or what current (amps) is going into the battery. Nice new maintenance free batteries don't charge very fast at 14volts, so it takes a long time to charge them. If you stop and keep your 400watt stereo going at tickover or even worse with the motor stopped you will quickly drain your battery. The solution is to only have the music loud above about 2000 revs and drive at least an hour a day. Of course make sure that you have enough reserve energy in your battery to keep all the equipment like the alarm running for the amount of time you leave the car. Get your standby current measured and work out how many amp hours you need to keep all systems running. If it's for two weeks at the airport then consider getting your battery fully charged before you go. Takes about 40 hours or so. If the battery is flat when you get home don't let the friendly mechanics boost charge it unless they can guarantee that it won't damage the battery or blow up your car electronics as they will be using your probably dead battery to keep the volts stabilised. When it doesn't it'll be your fault. Disconnecting the battery does prevent it going flat but without your alarm your insurance is probably invalid. You could use a nice big leisure battery in the boot or use a solar charger to keep your battery topped up. These remarks don't apply to hybrid cars as the car electrics are totally new.

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Hi

First of all, ensure none of the "hidden" electrical equipment is staying on, such as the trunk light for instance. You can do this by tipping the rear seats forward and looking into the trunk from there with the lid closed.

If this is not the case, then you need to have the charging system checked out because the problem could lie with the alternator leaking to ground.

Very best regards

Geordie

Posted on Jun 10, 2008

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