air flow sensor ?

[patrick300]

I am working on a 77 911 with a 2.7 engine well i just removed the air box and intake manifold tubes, i notice the the connector that goes to the back of the air flow sensor was not hooked up to anything on the other end of the harness, it has 2 wires a brown and a white, well the brown is bolted as a ground over by the left side where the fuses and ingnition items are, as for the white wire its not pluged into anything it has a white connector that looks like it should go to a spade connector, so i dont think the sensor oon the back of the air flow unit is working, does anyone know where the white wire should plug into, thanks for any help