Thread: Battery Drain in Disco - D2A

Kev, I dont know a lot about discos, but I do know that if you have an ERPS (electronic rust prevention system ) installed this does happen. I have one in my 110 county and if I dont start it for over 2 weeks the battery is low. They say that they dont draw much power but it is enough to lower the voltage over a couple of weeks. Regards....Brian

I know the 'Main Battery' must still power the essentials like - clock - alarm system - ecu - etc - when parked for any period of time .
So there will always be a constant power drain from the battery .
Just interested in how much a D2A draws in power off the battery when it's in this situation .
Thanks .

My guess would be 400 - 500mA but over 3 weeks that's about 250A so even half that will flatten the battery

cheers, Andy

Have been told by an Auto lecky that the ABS systems on Disco,s draw power when the car is stopped and will drop the voltage enough so it wont start if left to long.
Cheers Ean

Checked my D2 this morning with a digital clamp meter & it draws .38 of an amp.It hasent been moved for a day or two so will be totally asleep.

I am sure mine started 1st go after not going anywhere for 3 weeks once when we went overseas,but i cant remember for sure.

I am not an auto lecky,but this only equates to total of 8 amps over 21days,so it should do it easy.

I am pretty sure the battery should be around 200a,cant see what mine is without taking it out.

Hope this helps

Hi Kev, while there are a few thing that draw power with the engine off, these collectively would not draw more that 20 to 30 milliamps and normally over a three week period should not drain the battery to the point it could not start the motor.

What is more likely to cause these devices to flatten a battery in that sort of time period is if your battery was not fully charged when you last stopped the motor.

Do you have any idea of how much driving time you had done before you left the Disco parked for the three weeks?

some times if someones setup a system that operates in the same frequecny block as your remotes for the alarm system then the security system doesnt go into "sleep" mode and draws something like half an amp. half an amp for 3 weeks will drop the battery enough that it wont start a disco especially if theres a dodgey earth somewhere thats giving the ECU or the security system the squirts.

Originally Posted by drivesafe

Do you have any idea of how much driving time you had done before you left the Disco parked for the three weeks?

Hi Tim
My Dad's been sick lately so haven't done any long trips since the June long weekend with Redback and Yorkie .
So the disco has only done a few short local trips over the past few months .
Do you think this has contributed to the condition of the battery ?
Thank's .