I'm going to be putting some power locks/windows in my '85 Firebird, but the schematics call for a relay, which I'm not sure if I have. Anybody know where it would be in an '85? Also, if I don't have one in mine, there are two 83's at the local junk yard that I know has power locks, so must have the relays.

If anybody knows where to find the relay in any of those years, please reply. Thanks! =)

 

There's a fair bit of wiring connected to the PDL relay; might be easiest to grab all you can from one of the cars you mentioned. Take a notebook and record where each wire goes to in order to simplify the installation into your car.
Oh, the relay itself should be located behind the drivers side kick panel, near the hood release handle.
Good luck!

Pete