Opened it up.
I soldered it back together and will bring it to have it tested tomorrow. All the diodes measured good brushes wer good bearings were good. Could that have really been all that it was?
This is the one that was draining my battery. I haven't taken The one out that failed on me yesterday. I hate replacing alternators in this car. I have to pull the headlight to get to the intercooler couplers and the power steering pump... Bullox.