Just got back from Autozone. They tested it and confirmed what I had been getting.

He used his tester and reported Alternator PASS. So I then turned on the lights. The tester then said Regulator FAIL. Alternator PASS.

So I'll try to dig out my old VR. I keep old items like that for this very reason. Charging the battery tonight as it is completely dead again and hopefully it is just the regulator.

If not, I'm pretty sure it is electrical-related.

Is there a way I could read the draw at the fuse for the headlights? Would that give me any indication of anything?

Side Note: Prior to this event, I have never had a dead battery and I run a 300W amplifier, new Alpine headunit, all new speakers, a 800W Sub and A/C all the time...So I don't think my amperage on the alternator is the problem here. Either way in the future I will go with the 80A unit.

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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