2002 BMW X5 Whistling noise and battery

2002 BMW X5
80,500 MILES • 6 CYL • AWD • AUTOMATIC
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MICHELLEVA
  • MEMBER
  • 1 POST
Hello,

I just replaced the battery in my 2002 BMW X5. After sitting overnight, it would not start. Jumped the vehicle and it started but barely. It is also making a whistling noise when the engine revs.

A friend suggested it might be the alternator because it is still sluggish in starting.

Thank you for your help.
Jan 18, 2009 at 9:01 AM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
Your friend is possibly correct. Check the voltage at the battery and lift the hood and listen for the whistling noises source. Battery voltage should be about 13.8 - 14.2 volts with the engine running and the lights on.
Jan 19, 2009 at 8:52 AM
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