Wiring Question

[BertMac]

1970 C10 6 cyl powergllide no A/C
Ok I have two wire I don't know where they go.

Passenger side of tranny up close to bellhousing area there is a switch with a (black, maybe brown) wire coming of of it. Where does it go?

and there is a relay on the firewall by the heater bow that has 3 wires

Red- 12 volts
green- idle stop selonoid
Blue-?????????????

So where do the (Black or Brown) from tranny do and the Blue wire from the relay go.

Thanks
Bert