Called Crutchfield Tech support. He made some calls as well. Their thought is that it is the power for the antenna (particularly if the wire has some color markings under the black sheath.
I'll have to test that when I get home, but it makes some sense as the harness did not otherwise have a connection for the power antenna. I will be connecting the new head unit in and powering it up before I mess with this wire, just to see if the antenna powers already. PO put in a replacement antenna and disabled the antenna power switch, so a bit of trial and error may be needed.
It is in fact a terminal for the antenna power - simple rolled clip connector latches onto that spade. If you still have your antenna switch, look for a solid blue wire coming from pin bushing 2 of the connector (page 127 of the ETM). If the wire harness has been cut, I can help you get it back to stock - PM me if interested.
I bid a vacation in October for a convention Les & I go to - let me know when you want to come out . . . you're at my house and we'll do it right!
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