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Eric, Automotive Repair Shop Manager
Category: BMW
Satisfied Customers: 32039
Experience:  20+ yrs. experience as repair shop manager and technician.
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I replaced the black box that is attached to battery and

Customer Question

I replaced the black box that is attached to battery and that fixed the problem for about thirty days know dead again?
If you let it set a couple of days it will start but
Then it goes into complete shut down nothing
Submitted: 2 years ago.
Category: BMW
Expert:  Eric replied 2 years ago.
I am sorry that you have not been helped yet. I just came online and saw your question
Ok, you have a parasitic drain on one of the many circuits. If wanting to diagnose and repair yourself, you will need a good digital multimeter that can test voltage, resistance in ohms, as well as amperage, and a good understanding of 12v DC systems and ability to read and interpret wiring diagrams.
If you do, then let me know and we can start testing the electrical system