Join Date: May 2009
Location: Marietta GA
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|3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.|
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You don't say if you had the battery tested. If the battery is bad it will not hold charge. Also you could check the voltage at the battery to see if getting full voltage. If voltage is less than at the alternator then there is a drain someplace. Just some thoughts.
Assuming the battery is installed and car can run, I have done this by 1st getting the voltage at the battery studs with car off. Should be 12 to 12.5 volts. The ground path for the battery is the car chassis. Next I start the car and test the volt between the + stud wire connection on battery and some metal point in the trunk. Voltage measured should be higher than battery, car off, if alternator is working well and have good connection to the battery, around 14v.
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