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The mkiv Supra Owners Club

Flat Battery - Again


MrRalphMan

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Ello all,

 

I hope that someone can give me an idea of what might be wrong.

 

About a month ago, I started having problems starting the car.

I don't get to use the car that much and after about a week, the car would be dead, nothing just some dull lights.

 

I purchased a new battery and everything was fine for a while, but last night it wouldn't start again.

I hadn't used the car for about a week and a half.

I got in, nice bright lights. Turned the key and got a quick succession of clicks (click.click.click.click you get the picture).

After a couple of tries I didn't even get this and I started to get a slow clicking, which I think was the alarm trying to go off.

 

Any idea on what might be draining the battery? I know that's not much to go on, but any idea might help.

 

My suspicion is that it is the alarm draining it.

 

Still, let me know what you think.

 

Paul.

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Guest gzaerojon

i had the same thing once, i only use mine at weekends.

went to start it and a relay just kept clicking.

my AA mate popped round with his booster box and tester,

we started it up and ran it for about 10 mins, then turned it all off.

when he tested it, he noticed something was drawing a very small amount of amps (he said that it would be enough to drain the battery in a week) so we went over the car and the only thing we found was the stereo pannel being on (but not playing a cd) when turning it off, the amps being drawn dropped almost to zero.

now i make sure its off and its been no probs ever since.

 

hope this helps mate

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gzaerojon has hit the nail on the head with this one - I was having exactly the same problem as you guys.

 

I thought it was the alarm but it took a little while, but i noticed that the blue light on the outer edge of my CD player remained on - I previously thought it was just made of some reflective type material and ignored it. you'll need to simply remove your dash panels and either re-wire or unplug the connector feeding the light.

 

Another source of constant drain may be the green ring light around your ignition - check to see if that remains on constantly too. must admit, mine is ok now even though it is still draining a little too fast.

 

trouble is, when the battery drains the alarm keeps going off and since that has its own little backup - unplugging the main batt doesn't help!!!

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magicmatty - do you have your LEDs wired to the positive that only draws power when the ignition is on?

 

It seems like a common problem and so that's good to know. Even though I've reduced the current drain it still seems a little high. I still have the warranty on my alarm/immobiliser so I might call the guy and ask a few eleccy questions cos we may all be having the same problem.

 

As I'm not electrically minded at all, any suggestions what i should ask, like "how much drain should there be?" :thumbs:

 

D

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  • 2 weeks later...

It's always the alarm..... :rolleyes:

 

 

 

 

 

 

 

 

Well, actually, it isn't. In fact it's very rarely the alarm.

This is something we get very frequently. Mostly from the bloody AA. in at least 90% of cases its the battery. People seem to be unwilling to accept that a battery that's only a couple of years old could possibly be knackered.

 

In the case of the Supra. If it's not your every day car, and it's likely to not be used for a week or two, disconnect the battery.

Every time a normal car battery is flattened, it gets weakened. It's called 'deep cycling'.

Normal lead acid batteries HATE being deep cycled. It kills the electrodes inside the battery, and will irreversably weaken the battery. As a rough guide, if you deep cycle a battery about 5 times, it will only last a few days without going flat. 10 times and you'll be lucky if it survives a night.

 

I've got all sorts of gizmos in my car which can cause drain issues and it can easily be left for 2-3 weeks with no problem. (I will always recharge it after 3 weeks regardless).

 

Hope that helps.

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