I also agree, you still have a problem. If you have an oscilloscope available you could scope the output of the alternator, and if you have a bad diode (or two), you will see that the output is missing some peaks. (The output waveform should have regular peaks, with none missing. One thing that sometimes happens to alternators is that the belt is loose or is glazed enough that it will start to slip under load - have you checked the belt tension? I was caught by that one once... It's a bad one, because sometimes after you tighten the belt the alternator will be outputting it's peak current, trying to charge the battery, and will overheat and blow a diode or two.

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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C