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      01-26-2013, 10:13 AM   #4
Dackelone
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Drives: 135i Silber mit/Rot 6MT N54
Join Date: Feb 2010
Location: Bayern, Germany

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You can measure the "standing" battery voltage when the car sits over night. You should see at least 12.8 volts at the battery terminals. Anything lower and your battery is toast.

Also... start the car up and check the voltage again at the battery. You should see over 13 volts. That way you know the alternator is working.