I was just going to say you should consider the upgrade. I don't see that you've been thorough in your troubleshooting. If you've replaced the regulator and the bearings are not noisy maybe you should check the wiring on the alternator. Jack the car up and check that the wires are solid on the alternator and also where they terminate on the distributor block/battery. If that checks out, move to the belt and make sure that there is enough tension to to spin the alternator so it charges. Also crank the engine and check the output of the voltage of the alternator. You should be at about ~14.4v.

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1990 190E 3.0L