Where is the turn signal flasher unit on a 93 Ford Aerostar?

It's located on the left hand side of the fuse block. It's the same part as the hazard flasher. Most vehicles use two different parts. It looks like a three prong relay. Since the fuse block has it's back facing toward the side of the vehicle, the flasher is in front of the fuse block. If you would sit in the driver's seat, it would be directly in front of you under the dashboard.