[Chevelle-list] blower motor wiring cont'd

[John Nasta]

The fan works when hooked directly to electrical power but the purple  
lead is dead all the time.

I'm trying to figure out where the power is supposed to be coming  
from. I'm not great at reading wiring diagrams, but it looks like  
there is a 14ga brown wire coming from the fuse box to the "master  
switch" (whatever that is) and a 14T (tan?) wire going from that  
switch to the blower switch.

This is the diagram I am using:

http://johnnasta.com/69-AC-wiring001.jpg

Can anyone confirm where I am supposed to be tracing power from?

Thanks,
John Nasta