Battery Drain on X5 4.4 2001

[turquise1]

This has been going on for a couple of years now. Everything is ok during summer when the weather is hot (in Chicago) but when weather gets colder, the battery is drained and dead in a couple of days or so. I killed 2 batteries so far and I am not sure Interstate will honour another warranty claim.

I already did the drain test and could not find the source. I have been reading about the GM3 not working properly because of its old capacitors especially when it is cold but replacing them did not seem to help either.

Right now, my X5 seems to go to sleep around 32 mins as shift light and IHKA fan turning off but the battery is almost dead again the next day as the car hardly starts.

Obviously, the alternator is checked and working fine.

I will do more drain testing but meanwhile I would appreciate any advise I can get..

Thanks for your help in advance..

Ozzie..