This thing is so random...

The draw seems to happening with A/C now, not lights.

At this point I am getting tired of chasing as I don't think this is electrical gremlins anymore. Battery or Alternator.
So Today:
1) I bought a new OE MB Battery. Put her in, but no change, but car starts up faster (not just due to battery being charged. She started up much faster than I have ever seen!!)

2) Bought new Bosch Voltage Regulator. No change.


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I am now going to replace the alternator. Since I am doing it, I may as well upgrade to the 80A unit.

Does the upgrade just require a pulley swap...anything else? Is the connector the same as the 70A?
I want the most painless upgrade possible for both myself and my wallet.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k