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Steve, BMW Expert
Category: BMW
Satisfied Customers: 24115
Experience:  BMW Expert
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My 2004 745li battery will not keep a charge and i have the

Customer Question

my 2004 745li battery will not keep a charge and i have the battery tested as well as the alternator they said both were fine but i get a lot warnings and dash goes blank when i turn it off and restart its fine but when idle the car and rev up the lights follow the rising and dimming of the rpm's
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 operating voltage with the engine running?
Customer: replied 1 year ago.
Varies between 13.8 - 14.1
Expert:  Steve replied 1 year ago.
I will provide an honest answer. I trust this will be appreciated. Please remember that a low rating PUNISHES me for being honest and that I receive nothing for my time until a positive rating is clicked.
There is the answer. The alternator is definitely bad. It should be more like 14.5 and steady. Have the alternator replaced.
Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.
Customer: replied 1 year ago.
Thank you
Expert:  Steve replied 1 year ago.
You are welcome. Please do not forget to CLICK ON a positive rating.