Can some one tell me where the wires on the alternator wire harness go to...in particular the brown wire for a '91 Firebird.

 

It will go to two places because it has a splice in the engine compartment. Inside the engine compartment it will go to pin "D" of the coolant fan relay. It also goes to pin "G8" of connedtor C100 on the firewall and from there it goes to the "FAN" fuse on the fuse block.

 

Thanks.
Installing this Gen 7 wiring harness and cut a lot of wires.
Trying to patch back where I can and it make sense.