Quote:
Originally Posted by BillW2
My late MY 2021 545E is broken down in MI. 12 Volt system is dead. There are 2 12 volt batteries in mine. A very large 950 CCA battery and a compact 575 CCA battery. The big one is so dead that it will not even power my battery tester. Had to have it towed to a dealer an hour away last evening. I was planning on driving 750 miles to NC today. Very disappointed a 2 year old car has left me stranded out of town for an unknown duration. The dealer has now had the car for 3/4 of a day and still hasn't figured out why it is dead. I did jump it and it would only run while connected to the jumper battery. My guess is that the big battery is so bad it can't even allow 12 volts to pass through it. Time will tell. I loved my X5 till now but this is so frustrating I might have to trade back to a Cayenne.
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Anyone know which of these two batteries powers the 12v systems vs the starter? Im thinking the larger one powers all the 12v stuff, but not sure.