Well, after a couple days and about an hour or so total driving, I'm not 100 convinced that my problem is solved. I unlocked the OBC tests and read Test#9 - Voltage.

It's showing 11.2 volts with the engine off and with it running.

Plugged in my charger and it shows 12.3v.
I'm going to give it a full charge and test again, but I think I'm probably headed to the dealer for diags. (and a new alternator?)

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'04 E53 X5 4.4i
'05 Mazdaspeed MX-5
'00 Saab 9-3 SE Cabrio