Question about 1995 BMW 5 Series

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Battery problem i just added a  two amp radio system on my 1995 528i bmw and the battery drains overnight. i checked the battery cells and two of them are in bad shape. could my new sound system be whats killing my battery cells?

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Check the battery for a draw, if you know how to use a Ampere meter, put it inline and make sure all doors are closed, and if the car has a lamp under the hood disconnect it. With the Ammeter in line, you should see a reading on the meter.
If there is a reading, disconnect the amp power connector and the reading should drop. If it does, you may have to install a power relay to control the amplifiers to ensure they do not drain them in future.

The second possibility is that the power consumption of your amps is preventing the battery from charging completely. Especially if the battery has bad cells. It would be helpful to know what amprerage your alternator is putting out and what the amperage draw of your amps are while in use.
Of course if demand is higher than supply then the battery will have difficulty keeping up.

One quick check is to check battery voltage with a meter, start the car, check the voltage is it around 13 volts and increasing, turn on the amps, again check the voltage, is it still increasing or decreasing. Rev the car up a few rpm's If it is decreasing then you are taxing the charging system.
Replace the battery and try these tests again.

Hope this is of some help.
Ed

Posted on Apr 20, 2009

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