I got in touch with GM today they told me to get a Metri pack 150 4 pin connector and put the wire from my harness in the B slot and plug it in . He said that's all it needs. When I told him the story about the Alt and plug difference he put me on hold and when he came back that was his reply. He sent me an e mail with a schematic and picture of the connector and told me to ignore the schematic.
I'll try to post it tomorrow.
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