Installing new wiring harness for heater blower motor and dash switch in my 68 C10

[HeavyHauler]

Later this afternoon I will be installing a new wiring harness for the heater blower motor in my 1968 Chevy C10 which only came from the factory with a heater and no AC.

There is a brown wire that goes from the blower motor switch at the dash controls to the fuse panel?

I see the heater fuse in the panel but I am wondering how that brown wire connects to the fuse panel and where?

Any help is appreciated and thanks.