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Roger
Roger, BMW Master Tech
Category: BMW
Satisfied Customers: 3037
Experience:  10 yrs. experience as BMW Master Technician, shop foreman and dealer.
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WHen I start my 2003 Z4 I sometimes get a yellow battery

Customer Question

WHen I start my 2003 Z4 I sometimes get a yellow battery warning light after a few seconds. It goes off after driving a couple of hundred yards. My mechanic checked the system, replaced the alternator and belts. I still sometimes get the same warning light? Should I worry and what should I do?
Submitted: 1 year ago.
Category: BMW
Expert:  Steve replied 1 year ago.
Hello and welcome,
My name is ***** ***** it will be my pleasure to assist you today.
What is voltage with the engine running and the engine off?
Customer: replied 1 year ago.
I do not have direct access to the battery terminals. At the Jump-start access box I get a cold reading of 1.4v and with the engine running I get 3.3v. (I checked my meter agaist a C cell and got 1.3v) I hope thhis helps.
Expert:  Steve replied 1 year ago.
please check again at the battery.
the car would not start or run with the readings you provided.
Customer: replied 1 year ago.
I cannot see the battery in the engine compartment. Can you advise me on its location and how to access it on my 2003 BMW Z4?
Customer: replied 1 year ago.
I finally was able to locate the battery on my own. With the engine off, the battery reads 21.41v. With th ebattery running, the battery reads 14.10 v,
Customer: replied 1 year ago.
Correction: with the engine off, the battery reads 12.41 v.

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