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2002 BMW X5 Whistling noise and battery

Tiny
MICHELLEVA
  • MEMBER
  • 2002 BMW X5
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 80,500 MILES
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.
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Sunday, January 18th, 2009 AT 5:01 PM

1 Reply

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 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.
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Monday, January 19th, 2009 AT 4:52 PM

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