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2000 BMW 528 Won't start

Tiny
RDEEL
  • MEMBER
  • 2000 BMW 528
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 72,000 MILES
I noticed yesterday morning that when I went to start the car, the battery sounded weak, but started. Over the course of the day, each time I started it, it sounded weaker and weaker finally to the point of not starting at all - just doing the clicking thing. My husband (an electrician) put a meter on the battery and said that it read 12 volts. He then jump started it with his truck and it started fine. We let it run for a little bit, then turned off and restarted which it did. That was last evening. When I went to start it this morning, it sounds real weak again.

Can it be the battery even if it still reads 12 volts or is it something else like the alternator? Thanks for you help.
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Tuesday, June 10th, 2008 AT 11:04 AM

1 Reply

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Yes it can be the battery. Lead acid type batteries when fully charged should show at least 12.5 volts and should show about 14 volts with the engine running. I do not recommend jump starting BMW automobiles as the electronics are extremely sensitive to large voltage excursions.
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Tuesday, June 10th, 2008 AT 11:54 AM

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