Stan, the wire you asked about is connected from the center post of the 153 to the center post of the O22 switch.
I disconnected it at the switch side and ran a wire connected to it to the Black wire coming out of the AIU like you said....
It WORKS PERFECTLY! Green light when curved, and red light when straight.
WOW! I can't tell you how sweet this is....to ask a question from a stranger and get this immediate response and sharing of information.
Thanks,
Frank