Q: Belt ok Battery ok, Some discharge when motor is running.Cleaned battery cables, Help!!! 1995 BMW

A: Are you sure that the alternator is charging fully? Having changed it does not mean that the replacement is a good one not unless it is a really brand new alternator. Used/rebuilt alternators are notorious for not giving the proper amps ratings (due to bad diodes). Other than the above, you would have to disconnect fuses one by one until you find the circuit that is drawing more current than usual.
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