Quote:
Originally Posted by dghii
Yes, batteries can go dead in an instant! Had it happen to a 1999 Z3 in 2001. Drove to my Son's school to pick him up one afternoon...no issues. We walked out of the school, go in the car and nothing! Bad battery.
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Did your alternator die at the same time that day? The only other battery problem I had was when I drove around Chicago, did errands for an hour, then 20 minutes back on the highway, then it died while parked doing errands locally and I had to bump start it. In the next two days I ended up replacing the battery and the alternator, and the shop that diagnosed it said they couldn't telll which took which out.
Now I wonder if in my case the alternator died first, took the battery to the grave with it, and then we replaced the battery. If I remember correctly, I think the new battery died the next day, indicating the alternator pre-deceased it. The shop charged me like $350 for what might have been a faulty diagnosos, the new battery, and installation, so then I swapped the alternator myself which was barely doable due to tight working conditions in there. But I also heard the battery and alternator often take each other out and you can't always tell which went first. I dunno, not a strong area for me..
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