Battery Draining - Parasitic Drain

Having a problem with the battery draining overnight.
Checked yesterday evening and I had 11.5 volts which I know is low.
This morning car wouldn't unlock. Checked battery and only 6 volts.
Checked Alternator charging and it's 13.8 whyen running.
After charging battery I reinstalled in car and carried out a test for Parasitic Drain.

Disconnected the Negative and connected my multimeter between terminal and the lead.
I'm draining between 3.7- 3.9 Amps.
1) Pulled all the fuses one by one but meter never dropped below 3 amps.
2) Disconnected alternator as I understand a faulty diode can cause a drain even when engine is off.
3) Disconnected DSP.
4) Disconnected Intravee.
5) Checked Cubby and Boot lights are going off.

None of the above saw the amperage drop below the 3 amp mark.

Although the battery is only 8 months old I'm wondering if there is a Cell/Internal fault causing the drain?
Anything else I can check?

If not will see if Eurocarparts will check/swapout the battery.
Failing that will see if I can get it looked at under my Mondial warranty.

TIA.

Remove cables to one/both terminals to see if the voltage drops? This will tell you if the battery is losing its charge due to internal issues.

Talksthetorque said:

Remove cables to one/both terminals to see if the voltage drops? This will tell you if the battery is losing its charge due to internal issues.

Click to expand...

Cheers for that.
Battery is off the car at the moment being charged. Will carry out some 2 hourly readings once charged before putting back in the car in the morning.

After not being able to resolve this problem I reluctantly put the car into my Dealers to have a look.
They had the car for nearly two weeks due to the nature of the fault(had to wait for car to go to sleep) before fault finding.
They eventually traced it to a fault with the Gaptech module that was waking the car up through the night.
I'd forgot all about the Gaptech as I'd fitted it such a long time ago or I would of removed it during my tests.
As it was a 3rd party device causing the problem the work wouldn't be covered by my BMW warranty. :-(
Stephen James (Enfield) were brilliant though. They got the labour down to 4 hours at their lower rate of £80 ph then reduced further down to £280 total.

Hope this helps someone in the future if they have similar problems.

The Gaptech was working perfectly from install up 'til it was removed.


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