71 Cuda A/C wiring diagram???

Does anyone have one they can post?

I have the add-on pigtail but don't know where to link it in and my factory manuals don't show any examples with a/c.

For a 71 challenger, I'm thinking cuda is the same.

It's a grey wire and it is part of the blower motor 4 pin connector that comes out of the fuse block on the firewall.
It's the wire my screw driver is touching.