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I just went through a similar problem....11.77 volts at battery with engine running and alternator/charging light on whenever the key was turned to run or engine was running.
I had a new tranny ground strap and ground at battery good, so I suspected the alternator or regulator. I had external regulator and replaced with new solid state unit. That didn't solve my problem so I removed my alternator. Pretty easy - just a bit fiddly getting nuts off the air guide behind alternator. Then lots of mucking around checking the ground from alternator to engine block. Making sure that was good and placing all grounds on same D- terminal fixed the problem for me. Isn't there an alternator-starter connection to check as well?
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