Where is the signal flasher on 2002 mustang gt?

The signal flasher relay on a 2002 Ford Mustang GT is located in the fuse box under the hood. It's not a separate easily identifiable component like a large relay; it's usually a small relay within the fuse box itself. You'll need to consult your owner's manual or a wiring diagram to pinpoint its exact location within that fuse box. The manual will show a diagram of the fuse box and indicate which relay is the turn signal flasher.