77 260Z Wiring Harness Help

[greggy2710]

So I’m in the process of putting back together my 77 260z and am reinstalling the harness.

There is a plug off the harness on the inside of the car, the first plug after the firewall, which I can’t find a home for. It appears to have 3 power wires in it and is a 5pin plug.

When I connect up battery power this plug has power but no where else inside the car does so obviously I’m missing what it plugs into.

I have poured over the wiring diagram which I have and can not find any reference to what this might be. 

As per the photo it has 3 x white and red wires, a red and white wire and a black wire.

Hopping someone can help me with this mystery.

Thanks

Greg