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SOLVED.
The connector was *STILL* shorting out when re-attatching the connector. Normal fix would be to replace the cable, but it is extremely expensive for what it actually is.
Hack way to get it to work is to shim the shorting pins just a bit to raise them off of the pins that are on the BST. Just layer a piece of electrical tape on the 'top' side of the connector that plugs into the BST. Be careful, you don't want any ESD (Electro-Static Discharge). I would advise that you work on this in high humidity to reduce chances of an ESD setting off the BST in your hands and in-front of your face.
This works with both the replacement BST I installed, and the BST that came with my car - even if it is not attached to the positive terminal.
BT cable cleared the code after this was fixed. I spoke to a BMW tech about the connector and the resistance needs to be within a range of about 2-4 ohms, otherwise the system raises a fault code.
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