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      12-04-2013, 10:52 AM   #21
GMSZ4M
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Drives: 2006 Z4M
Join Date: Dec 2013
Location: Dallas, TX

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Hi Guys. I drive a 2006 Z4M and have the same problem.

Here are my voltage test results. With Engine off, the battery is measuring at 12.5V. With the car on it's shows a reading of 14.2 at idle and jumps to 15.5 (max) if rev-ed up to 3K. I believe this to be within normal limits. Not sure what to do next to figure out if it's the battery or the alternator.

Also, am thinking of getting this, if the alternator is the issue, unless you can suggest something else.

Last edited by GMSZ4M; 12-04-2013 at 10:57 AM..
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