BMW Z4 E85 Battery Discharge

[RUDEY]

Has anyone had this problem? It's not the alternator or the headlights. It just drains. I have a truck battery. It still drains.

 

[pasjonauta]

I had the same problem with my 2003 Z4 E85. A brand new battery would die after about a week of the car sitting in the garage. In my case, the problem was with the navigation system, specifically the disc reader, which was constantly spinning the map disc. If you have a multimeter (even a simple one with an amperage function), you can isolate the source of the problem yourself by disconnecting fuse after fuse until the car's standby current consumption drops to 0.02-0.05 A.

 

[Harumaki]

I had the same problem (E85 2005).
Is there a device plugged into the cigarette lighter socket?
Depending on the model, there may be current flowing through it all the time.

 

[RUDEY]

Nothing is connected, however there is a wire connected to the back of the built in head unit that connects to the iPod? Could this really be enough to drain the battery? It bypasses the multichanger (which still hums occasionally).

 

[Games Goblin]

Follow this guide to check for parasites in your drain.

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Find out which fuse is the culprit and proceed from there.