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internal88
internal88, BMW Mechanic
Category: BMW
Satisfied Customers: 2490
Experience:  I have an Automotive Engineering Degree and also work for an Automotive engineering company since 2003.
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BMW Z4M 2006. BATTERY WENT COMPLETELY DEAD. REPLACED IT WITH

Customer Question

BMW Z4M 2006. BATTERY WENT COMPLETELY DEAD. REPLACED IT WITH A NEW BATTERY. STARTED FINE, UNTIL NEXT DAY. NEW BATTERY COMPLETELY DEAD. WHAT IS GOING ON?
Submitted: 6 months ago.
Category: BMW
Expert:  internal88 replied 6 months ago.

Hello I'm Brandon - BMW tech.

The alternator most likely is bad. The alternator is not charging the battery to it's normal state.

This is why the battery went dead the next day.

You will need to replace the alternator to fix.

Please rate me positive, thank you! Let me know if you have further questions.

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