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Don't even think of hooking up a voltmeter you can read while you're driving and the problem occurs. Never do any real diagnosis. Don't ever consider a subassembly like a voltage regulator or brushes. Never check the diodes in the alternator. Don't even check the continuity of all the electrical connections in the charging circuit.
No why should I do any thinking, First off It is not my car. You sat there and wrote that long post. You clearly marked your problem for me. You can write more post and test more things out. But if it was in my shop for diag, it would have been in and out before you finished writting your post.
I estimate about 28 ro's a week. So all my customer cars are fixed and happy. EXpensive part???? BENZ!!!!