Quote:
Originally Posted by wsmeyer
Interesting, thanks for taking the time to type all that. Straight off the charger it read 12.7 but I did not test it again after I took it out of the car. I was surprised at the 11.99 but it does somewhat coincide with their reading of 63%. I was going to pull the alternator and have them test that when I picked up the battery but I decided just to wait and see what happens with the battery first. I'm thinking there's a chance it simply won't charge up much more and they'll deem it bad and give me a replacement.
Of course none of this really explains why it died in the first place.
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Smart move to wait and see. I just replaced the water pump on my 4.8L yesterday, not sure I would look forward to removing the alternator.
One thing I have noticed with many of the BMW's if you make a lot of short trips with it, best to charge the battery every 2-3 weeks.
My guess is either the battery is bad, or the vehicle is used for a lot of short trips with a lot of starts and stops.
You really should consider an OBDII smart phone App or a UltraGauge.
I have an UltraGauge that I move from car to car, but it is nice because you can set threshold alarms and keep and eye on Engine Temperature and Charging Voltage.