chasing of e70 battery drain in progress

[Just Looking]

Alternator charging the battery and the battery drain are two issues, IMO. There are posts with suggested procedures to seek out the source of the battery drain. Essentially, you take the fuse out of the fuse box, one by one, until you identify the source of the problem. A multi-meter is quite cheap. I just bought one for under $20. With a quick search, you should be able to find posts from people who have already gone through this process. Alternatively, you can ask a dealership to diagnose. It will take a minimum of one hour, likely many more, to do a good job so that will be $$ expensive.

The drain could come from any module but again, the navigation system is a common source. Perhaps you can start from there first.

Good luck.

[Ron07x5]

Originally Posted by Just Looking

Alternator charging the battery and the battery drain are two issues, IMO. There are posts with suggested procedures to seek out the source of the battery drain. Essentially, you take the fuse out of the fuse box, one by one, until you identify the source of the problem. A multi-meter is quite cheap. I just bought one for under $20. With a quick search, you should be able to find posts from people who have already gone through this process. Alternatively, you can ask a dealership to diagnose. It will take a minimum of one hour, likely many more, to do a good job so that will be $$ expensive.

The drain could come from any module but again, the navigation system is a common source. Perhaps you can start from there first.

Good luck.

Yes Likely many hours for dealership to diagnose and then likely they will replace many more expensive parts as they replace the one likely cheap wire that has a short. I will suffer the education and learn to fix type of problem because unfortunately I assume this car will have this type of problem again. If it turns out to be an old wire I will replace all the old wires I can and not wait to have the problem again. Learning the truth will be interesting and will likely help many here in the future. No wonder BMWs out of warranty have such a poor resale value ... the market knows they have way to many costly issues to pay to have fixed. It a great driving machine provide you can deal with the issues!